[Apologies to Graeme Wood and The Atlantic for such long excerpts. Let me know if you need this taken down. But more people need to read this who may avoid the longer version.-BG]

The Islamic State is no mere collection of psychopaths. It is a religious group with carefully considered beliefs, among them that it is a key agent of the coming apocalypse. Here’s what that means for its strategy—and for how to stop it.

Graeme Wood, March 2015, The Atlantic

What is the Islamic State?

Where did it come from, and what are its intentions? …In the past year, President Obama has referred to the Islamic State, variously, as “not Islamic” and as al-Qaeda’s “jayvee team,” statements that reflected confusion about the group, and may have contributed to significant strategic errors.

The group seized Mosul, Iraq, last June, and already rules an area larger than the United Kingdom. Abu Bakr al-Baghdadi has been its leader since May 2010, but until last summer, his most recent known appearance on film was a grainy mug shot from a stay in U.S. captivity at Camp Bucca during the occupation of Iraq. Then, on July 5 of last year, he stepped into the pulpit of the Great Mosque of al-Nuri in Mosul, to deliver a Ramadan sermon as the first caliph in generations—upgrading his resolution from grainy to high-definition, and his position from hunted guerrilla to commander of all Muslims. The inflow of jihadists that followed, from around the world, was unprecedented in its pace and volume, and is continuing.

… We can gather that their state rejects peace as a matter of principle; that it hungers for genocide; that its religious views make it constitutionally incapable of certain types of change, even if that change might ensure its survival; and that it considers itself a harbinger of—and headline player in—the imminent end of the world.

The Islamic State, also known as the Islamic State of Iraq and al-Sham (ISIS), follows a distinctive variety of Islam whose beliefs about the path to the Day of Judgment matter to its strategy, and can help the West know its enemy and predict its behavior. Its rise to power is less like the triumph of the Muslim Brotherhood in Egypt (a group whose leaders the Islamic State considers apostates) than like the realization of a dystopian alternate reality in which David Koresh or Jim Jones survived to wield absolute power over not just a few hundred people, but some 8 million…

We are misled in a second way, by a well-intentioned but dishonest campaign to deny the Islamic State’s medieval religious nature… In fact, much of what the group does looks nonsensical except in light of a sincere, carefully considered commitment to returning civilization to a seventh-century legal environment, and ultimately to bringing about the apocalypse.

The most-articulate spokesmen for that position are the Islamic State’s officials and supporters themselves. They refer derisively to “moderns.” In conversation, they insist that they will not—cannot—waver from governing precepts that were embedded in Islam by the Prophet Muhammad and his earliest followers. They often speak in codes and allusions that sound odd or old-fashioned to non-Muslims, but refer to specific traditions and texts of early Islam…

The reality is that the Islamic State is Islamic. Very Islamic. Yes, it has attracted psychopaths and adventure seekers, drawn largely from the disaffected populations of the Middle East and Europe. But the religion preached by its most ardent followers derives from coherent and even learned interpretations of Islam.

Virtually every major decision and law promulgated by the Islamic State adheres to what it calls, in its press and pronouncements, and on its billboards, license plates, stationery, and coins, “the Prophetic methodology,” which means following the prophecy and example of Muhammad, in punctilious detail. Muslims can reject the Islamic State; nearly all do. But pretending that it isn’t actually a religious, millenarian group, with theology that must be understood to be combatted, has already led the United States to underestimate it and back foolish schemes to counter it….

I. Devotion

…In November, the Islamic State released an infomercial-like video tracing its origins to bin Laden. It acknowledged Abu Musa’b al Zarqawi, the brutal head of al‑Qaeda in Iraq from roughly 2003 until his killing in 2006, as a more immediate progenitor, followed sequentially by two other guerrilla leaders before Baghdadi, the caliph. Notably unmentioned: bin Laden’s successor, Ayman al Zawahiri, the owlish Egyptian eye surgeon who currently heads al‑Qaeda. Zawahiri has not pledged allegiance to Baghdadi, and he is increasingly hated by his fellow jihadists. His isolation is not helped by his lack of charisma; in videos he comes across as squinty and annoyed. But the split between al-Qaeda and the Islamic State has been long in the making, and begins to explain, at least in part, the outsize bloodlust of the latter.

Zawahiri’s companion in isolation is a Jordanian cleric named Abu Muhammad al Maqdisi, 55, who has a fair claim to being al-Qaeda’s intellectual architect and the most important jihadist unknown to the average American newspaper reader. On most matters of doctrine, Maqdisi and the Islamic State agree. Both are closely identified with the jihadist wing of a branch of Sunnism called Salafism, after the Arabic al salaf al salih, the “pious forefathers.” These forefathers are the Prophet himself and his earliest adherents, whom Salafis honor and emulate as the models for all behavior, including warfare, couture, family life, even dentistry.

Maqdisi taught Zarqawi, who went to war in Iraq with the older man’s advice in mind. In time, though, Zarqawi surpassed his mentor in fanaticism, and eventually earned his rebuke. At issue was Zarqawi’s penchant for bloody spectacle—and, as a matter of doctrine, his hatred of other Muslims, to the point of excommunicating and killing them. In Islam, the practice of takfir, or excommunication, is theologically perilous. “If a man says to his brother, ‘You are an infidel,’ ” the Prophet said, “then one of them is right.” If the accuser is wrong, he himself has committed apostasy by making a false accusation. The punishment for apostasy is death. And yet Zarqawi heedlessly expanded the range of behavior that could make Muslims infidels.

Maqdisi wrote to his former pupil that he needed to exercise caution and “not issue sweeping proclamations of takfir” or “proclaim people to be apostates because of their sins.”

Denying the holiness of the Koran or the prophecies of Muhammad is straightforward apostasy. But Zarqawi and the state he spawned take the position that many other acts can remove a Muslim from Islam. These include, in certain cases, selling alcohol or drugs, wearing Western clothes or shaving one’s beard, voting in an election—even for a Muslim candidate—and being lax about calling other people apostates. Being a Shiite, as most Iraqi Arabs are, meets the standard as well, because the Islamic State regards Shiism as innovation, and to innovate on the Koran is to deny its initial perfection. (The Islamic State claims that common Shiite practices, such as worship at the graves of imams and public self-flagellation, have no basis in the Koran or in the example of the Prophet.) That means roughly 200 million Shia are marked for death. So too are the heads of state of every Muslim country, who have elevated man-made law above Sharia by running for office or enforcing laws not made by God.

Following takfiri doctrine, the Islamic State is committed to purifying the world by killing vast numbers of people. The lack of objective reporting from its territory makes the true extent of the slaughter unknowable, but social-media posts from the region suggest that individual executions happen more or less continually, and mass executions every few weeks. Muslim “apostates” are the most common victims. Exempted from automatic execution, it appears, are Christians who do not resist their new government. Baghdadi permits them to live, as long as they pay a special tax, known as the jizya, and acknowledge their subjugation. The Koranic authority for this practice is not in dispute.

Centuries have passed since the wars of religion ceased in Europe, and since men stopped dying in large numbers because of arcane theological disputes. Hence, perhaps, the incredulity and denial with which Westerners have greeted news of the theology and practices of the Islamic State. Many refuse to believe that this group is as devout as it claims to be, or as backward-looking or apocalyptic as its actions and statements suggest…

Many mainstream Muslim organizations have gone so far as to say the Islamic State is, in fact, un-Islamic… But Muslims who call the Islamic State un-Islamic are typically, as the Princeton scholar Bernard Haykel, the leading expert on the group’s theology, told me, “embarrassed and politically correct, with a cotton-candy view of their own religion” that neglects “what their religion has historically and legally required.” Many denials of the Islamic State’s religious nature, he said, are rooted in an “interfaith-Christian-nonsense tradition.”..

According to Haykel, the ranks of the Islamic State are deeply infused with religious vigor. Koranic quotations are ubiquitous. “Even the foot soldiers spout this stuff… all the time.” He regards the claim that the Islamic State has distorted the texts of Islam as preposterous, sustainable only through willful ignorance. “People want to absolve Islam,” he said. “It’s this ‘Islam is a religion of peace’ mantra. As if there is such a thing as ‘Islam’! It’s what Muslims do, and how they interpret their texts.” Those texts are shared by all Sunni Muslims, not just the Islamic State. “And these guys have just as much legitimacy as anyone else.”..

In Haykel’s estimation, the fighters of the Islamic State are authentic throwbacks to early Islam and are faithfully reproducing its norms of war. This behavior includes a number of practices that modern Muslims tend to prefer not to acknowledge as integral to their sacred texts. “Slavery, crucifixion, and beheadings are not something that freakish [jihadists] are cherry-picking from the medieval tradition,” Haykel said. Islamic State fighters “are smack in the middle of the medieval tradition and are bringing it wholesale into the present day.”..

The Koran specifies crucifixion as one of the only punishments permitted for enemies of Islam. The tax on Christians finds clear endorsement in the Surah Al-Tawba, the Koran’s ninth chapter, which instructs Muslims to fight Christians and Jews “until they pay the jizya with willing submission, and feel themselves subdued.” The Prophet, whom all Muslims consider exemplary, imposed these rules and owned slaves.

Leaders of the Islamic State have taken emulation of Muhammad as strict duty, and have revived traditions that have been dormant for hundreds of years. “What’s striking about them is not just the literalism, but also the seriousness with which they read these texts,” Haykel said. “There is an assiduous, obsessive seriousness that Muslims don’t normally have.”

Before the rise of the Islamic State, no group in the past few centuries had attempted more-radical fidelity to the Prophetic model than the Wahhabis of 18th‑century Arabia. They conquered most of what is now Saudi Arabia, and their strict practices survive in a diluted version of Sharia there. Haykel sees an important distinction between the groups, though: “The Wahhabis were not wanton in their violence.” They were surrounded by Muslims, and they conquered lands that were already Islamic; this stayed their hand. “ISIS, by contrast, is really reliving the early period.” Early Muslims were surrounded by non-Muslims, and the Islamic State, because of its takfiri tendencies, considers itself to be in the same situation.

[T]he caliphate has continued to embrace slavery and crucifixion without apology. “We will conquer your Rome, break your crosses, and enslave your women,” Adnani, the spokesman, promised in one of his periodic valentines to the West. “If we do not reach that time, then our children and grandchildren will reach it, and they will sell your sons as slaves at the slave market.”

In October, Dabiq, the magazine of the Islamic State, published “The Revival of Slavery Before the Hour,” an article that took up the question of whether Yazidis (the members of an ancient Kurdish sect that borrows elements of Islam, and had come under attack from Islamic State forces in northern Iraq) are lapsed Muslims, and therefore marked for death, or merely pagans and therefore fair game for enslavement. A study group of Islamic State scholars had convened, on government orders, to resolve this issue. If they are pagans, the article’s anonymous author wrote,

Yazidi women and children [are to be] divided according to the Shariah amongst the fighters of the Islamic State who participated in the Sinjar operations [in northern Iraq] … Enslaving the families of the kuffar [infidels] and taking their women as concubines is a firmly established aspect of the Shariah that if one were to deny or mock, he would be denying or mocking the verses of the Koran and the narrations of the Prophet … and thereby apostatizing from Islam.

II. Territory

Tens of thousands of foreign Muslims are thought to have immigrated to the Islamic State. Recruits hail from France, the United Kingdom, Belgium, Germany, Holland, Australia, Indonesia, the United States, and many other places. Many have come to fight, and many intend to die…

In November, I traveled to Australia to meet Musa Cerantonio, a 30-year-old man whom Neumann and other researchers had identified as one of the two most important “new spiritual authorities” guiding foreigners to join the Islamic State…

The caliphate, Cerantonio told me, is not just a political entity but also a vehicle for salvation. Islamic State propaganda regularly reports the pledges of baya’a (allegiance) rolling in from jihadist groups across the Muslim world. Cerantonio quoted a Prophetic saying, that to die without pledging allegiance is to die jahil (ignorant) and therefore die a “death of disbelief.” Consider how Muslims (or, for that matter, Christians) imagine God deals with the souls of people who die without learning about the one true religion. They are neither obviously saved nor definitively condemned. Similarly, Cerantonio said, the Muslim who acknowledges one omnipotent god and prays, but who dies without pledging himself to a valid caliph and incurring the obligations of that oath, has failed to live a fully Islamic life. I pointed out that this means the vast majority of Muslims in history, and all who passed away between 1924 and 2014, died a death of disbelief. Cerantonio nodded gravely. “I would go so far as to say that Islam has been reestablished” by the caliphate…

In London, a week before my meal with Cerantonio, I met with three ex-members of a banned Islamist group called Al Muhajiroun (The Emigrants): Anjem Choudary, Abu Baraa, and Abdul Muhid… Choudary and the others feature prominently in the Twitter feeds of Islamic State residents, and Abu Baraa maintains a YouTube channel to answer questions about Sharia…

Before the caliphate, “maybe 85 percent of the Sharia was absent from our lives,” Choudary told me. “These laws are in abeyance until we have khilafa”—a caliphate—“and now we have one.” Without a caliphate, for example, individual vigilantes are not obliged to amputate the hands of thieves they catch in the act… Choudary said Sharia has been misunderstood because of its incomplete application by regimes such as Saudi Arabia, which does behead murderers and cut off thieves’ hands. “The problem,” he explained, “is that when places like Saudi Arabia just implement the penal code, and don’t provide the social and economic justice of the Sharia—the whole package—they simply engender hatred toward the Sharia.” That whole package, he said, would include free housing, food, and clothing for all…

III. The Apocalypse

…During the last years of the U.S. occupation of Iraq, the Islamic State’s immediate founding fathers, …saw signs of the end times everywhere. They were anticipating, within a year, the arrival of the Mahdi—a messianic figure destined to lead the Muslims to victory before the end of the world… For certain true believers—the kind who long for epic good-versus-evil battles—visions of apocalyptic bloodbaths fulfill a deep psychological need. Of the Islamic State supporters I met, Musa Cerantonio, the Australian, expressed the deepest interest in the apocalypse and how the remaining days of the Islamic State—and the world—might look…

An anti-Messiah, known in Muslim apocalyptic literature as Dajjal, will come from the Khorasan region of eastern Iran and kill a vast number of the caliphate’s fighters, until just 5,000 remain, cornered in Jerusalem. Just as Dajjal prepares to finish them off, Jesus—the second-most-revered prophet in Islam—will return to Earth, spear Dajjal, and lead the Muslims to victory.

Abu Bakr al-Baghdadi was declared caliph by his followers last summer. The establishment of a caliphate awakened large sections of Koranic law that had lain dormant…

IV. The Fight

The ideological purity of the Islamic State has one compensating virtue: it allows us to predict some of the group’s actions… Choudary took pains to present the laws of war under which the Islamic State operates as policies of mercy rather than of brutality. He told me the state has an obligation to terrorize its enemies—a holy order to scare the shit out of them with beheadings and crucifixions and enslavement of women and children, because doing so hastens victory and avoids prolonged conflict…

One way to un-cast the Islamic State’s spell over its adherents would be to overpower it militarily and occupy the parts of Syria and Iraq now under caliphate rule. Al‑Qaeda is ineradicable because it can survive, cockroach-like, by going underground. The Islamic State cannot. If it loses its grip on its territory in Syria and Iraq, it will cease to be a caliphate. Caliphates cannot exist as underground movements, because territorial authority is a requirement: take away its command of territory, and all those oaths of allegiance are no longer binding. Former pledges could of course continue to attack the West and behead their enemies, as freelancers. But the propaganda value of the caliphate would disappear, and with it the supposed religious duty to immigrate and serve it…

And yet the risks of escalation are enormous. The biggest proponent of an American invasion is the Islamic State itself. The provocative videos, in which a black-hooded executioner addresses President Obama by name, are clearly made to draw America into the fight. An invasion would be a huge propaganda victory for jihadists worldwide: irrespective of whether they have given baya’a to the caliph, they all believe that the United States wants to embark on a modern-day Crusade and kill Muslims. Yet another invasion and occupation would confirm that suspicion, and bolster recruitment. Add the incompetence of our previous efforts as occupiers, and we have reason for reluctance. The rise of ISIS, after all, happened only because our previous occupation created space for Zarqawi and his followers. Who knows the consequences of another botched job?

Given everything we know about the Islamic State, continuing to slowly bleed it, through air strikes and proxy warfare, appears the best of bad military options. Neither the Kurds nor the Shia will ever subdue and control the whole Sunni heartland of Syria and Iraq—they are hated there, and have no appetite for such an adventure anyway. But they can keep the Islamic State from fulfilling its duty to expand. And with every month that it fails to expand, it resembles less the conquering state of the Prophet Muhammad than yet another Middle Eastern government failing to bring prosperity to its people…

The foreign fighters (and their wives and children) have been traveling to the caliphate on one-way tickets: they want to live under true Sharia, and many want martyrdom. Doctrine, recall, requires believers to reside in the caliphate if it is at all possible for them to do so…

Properly contained, the Islamic State is likely to be its own undoing. No country is its ally, and its ideology ensures that this will remain the case. The land it controls, while expansive, is mostly uninhabited and poor. As it stagnates or slowly shrinks, its claim that it is the engine of God’s will and the agent of apocalypse will weaken, and fewer believers will arrive. And as more reports of misery within it leak out, radical Islamist movements elsewhere will be discredited: No one has tried harder to implement strict Sharia by violence. This is what it looks like.

Even so, the death of the Islamic State is unlikely to be quick, and things could still go badly wrong: if the Islamic State obtained the allegiance of al‑Qaeda—increasing, in one swoop, the unity of its base—it could wax into a worse foe than we’ve yet seen. The rift between the Islamic State and al-Qaeda has, if anything, grown in the past few months; the December issue of Dabiq featured a long account of an al‑Qaeda defector who described his old group as corrupt and ineffectual, and Zawahiri as a distant and unfit leader. But we should watch carefully for a rapprochement…

V. Dissuasion

It would be facile, even exculpatory, to call the problem of the Islamic State “a problem with Islam.” The religion allows many interpretations, and Islamic State supporters are morally on the hook for the one they choose. And yet simply denouncing the Islamic State as un-Islamic can be counterproductive, especially if those who hear the message have read the holy texts and seen the endorsement of many of the caliphate’s practices written plainly within them.

Muslims can say that slavery is not legitimate now, and that crucifixion is wrong at this historical juncture. Many say precisely this. But they cannot condemn slavery or crucifixion outright without contradicting the Koran and the example of the Prophet. “The only principled ground that the Islamic State’s opponents could take is to say that certain core texts and traditional teachings of Islam are no longer valid,” Bernard Haykel says. That really would be an act of apostasy.

The Islamic State’s ideology exerts powerful sway over a certain subset of the population. Life’s hypocrisies and inconsistencies vanish in its face. Musa Cerantonio and the Salafis I met in London are unstumpable: no question I posed left them stuttering. They lectured me garrulously and, if one accepts their premises, convincingly. To call them un-Islamic appears, to me, to invite them into an argument that they would win. If they had been froth-spewing maniacs, I might be able to predict that their movement would burn out as the psychopaths detonated themselves or became drone-splats, one by one. But these men spoke with an academic precision that put me in mind of a good graduate seminar…

Non-muslims cannot tell Muslims how to practice their religion properly. But Muslims have long since begun this debate within their own ranks. “You have to have standards,” Anjem Choudary told me. “Somebody could claim to be a Muslim, but if he believes in homosexuality or drinking alcohol, then he is not a Muslim. There is no such thing as a nonpracticing vegetarian.”

There is, however, another strand of Islam that offers a hard-line alternative to the Islamic State—just as uncompromising, but with opposite conclusions. This strand has proved appealing to many Muslims cursed or blessed with a psychological longing to see every jot and tittle of the holy texts implemented as they were in the earliest days of Islam. Islamic State supporters know how to react to Muslims who ignore parts of the Koran: with takfir and ridicule. But they also know that some other Muslims read the Koran as assiduously as they do, and pose a real ideological threat.

Baghdadi is Salafi. The term Salafi has been villainized, in part because authentic villains have ridden into battle waving the Salafi banner. But most Salafis are not jihadists, and most adhere to sects that reject the Islamic State. They are, as Haykel notes, committed to expanding Dar al-Islam, the land of Islam, even, perhaps, with the implementation of monstrous practices such as slavery and amputation—but at some future point. Their first priority is personal purification and religious observance, and they believe anything that thwarts those goals—such as causing war or unrest that would disrupt lives and prayer and scholarship—is forbidden…

Western officials would probably do best to refrain from weighing in on matters of Islamic theological debate altogether. Barack Obama himself drifted into takfiri waters when he claimed that the Islamic State was “not Islamic”—the irony being that he, as the non-Muslim son of a Muslim, may himself be classified as an apostate… The ones who are susceptible will only have had their suspicions confirmed: the United States lies about religion to serve its purposes…

They believe that they are personally involved in struggles beyond their own lives, and that merely to be swept up in the drama, on the side of righteousness, is a privilege and a pleasure…

That the Islamic State holds the imminent fulfillment of prophecy as a matter of dogma at least tells us the mettle of our opponent. It is ready to cheer its own near-obliteration, and to remain confident, even when surrounded, that it will receive divine succor if it stays true to the Prophetic model. Ideological tools may convince some potential converts that the group’s message is false, and military tools can limit its horrors. But for an organization as impervious to persuasion as the Islamic State, few measures short of these will matter, and the war may be a long one, even if it doesn’t last until the end of time.