Mr. Barr has a long history of supporting just this type of “religious liberty.” At Notre Dame, he compared alleged violations of religious liberty with Roman emperors forcing Christian subjects to partake in pagan sacrifices. “The law is being used as a battering ram to break down traditional moral values and to establish moral relativism as a new orthodoxy,” he said.

Barr watchers will know that this is nothing new. In a 1995 article he wrote for The Catholic Lawyer, which, as Emily Bazelon recently pointed out, appears to be something of a blueprint for his speech at Notre Dame, he complained that “we live in an increasingly militant, secular age” and expressed his grave concern that the law might force landlords to rent to unmarried couples. He implied that the idea that universities might treat “homosexual activist groups like any other student group” was intolerable.

This form of “religious liberty” is not a mere side issue for Mr. Barr, or for the other religious nationalists who have come to dominate the Republican Party. Mr. Barr has made this clear. All the problems of modernity — “the wreckage of the family,” “record levels of depression and mental illness,” “drug addiction” and “senseless violence” — stem from the loss of a strict interpretation of the Christian religion.

The great evildoers in the Notre Dame speech are nonbelievers who are apparently out on the streets ransacking everything that is good and holy. The solutions to society’s ills, Mr. Barr declared, come from faith. “Judeo-Christian moral standards are the ultimate utilitarian rules for human conduct,” he said. “Religion helps frame moral culture within society that instills and reinforces moral discipline.” He added, “The fact is that no secular creed has emerged capable of performing the role of religion.”

Within this ideological framework, the ends justify the means. In this light, Mr. Barr’s hyperpartisanship is the symptom, not the malady. At Christian nationalist gatherings and strategy meetings, the Democratic Party and its supporters are routinely described as “demonic” and associated with “rulers of the darkness.” If you know that society is under dire existential threat from secularists, and you know that they have all found a home in the other party, every conceivable compromise with principles, every ethical breach, every back-room deal is not only justifiable but imperative. And as the vicious reaction to Christianity Today’s anti-Trump editorial demonstrates, any break with this partisan alignment will be instantly denounced as heresy.

It is equally clear that Mr. Barr’s maximalist interpretation of executive power in the Constitution is just an effect, rather than a cause, of his ideological commitments. In fact, it isn’t really an interpretation. It is simply an unfounded assertion that the president has what amount to monarchical powers. “George III would have loved it,” said Douglas Kmiec, a law professor at Pepperdine who once held Mr. Barr’s position as head of the Justice Department’s Office of Legal Counsel, of Mr. Barr’s theory. It’s almost beside the point to note, as the conservative lawyers group Checks & Balances recently wrote, that Mr. Barr’s view of history “has no factual basis.”

Mr. Barr’s constitutional interpretation is simply window dressing on his commitment to religious authoritarianism. And that, really, gets to the heart of the matter. If you know anything about America’s founders, you know they were passionately opposed to the idea of a religious monarchy. And this is the key to understanding the question, “What does Bill Barr want?”