Below is an interesting introduction to Bart Ehrman’s new Did Jesus Exist? The Historical Argument for Jesus of Nazareth. As a New Testament scholar who has specialized in the gospels and early Christianity and also as a skeptic, he was confused by the regular stream of questions about the existence of Jesus and was largely unaware of the internet skeptics who spill an enormous amount of pixels writing on this issue.

Here’s how he opens the book:

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Every week I receive two or three e-mails asking me whether Jesus existed as a human being. When I started getting these e-mails, some years ago now, I thought the question was rather peculiar and I did not take it seriously. Of course Jesus existed. Everyone knows he existed. Don’t they?

But the questions kept coming, and soon I began to wonder: Why are so many people asking? My wonder only increased when I learned that I myself was being quoted in some circles—misquoted rather—as saying that Jesus never existed. I decided to look into the matter. I discovered, to my surprise, an entire body of literature devoted to the question of whether or not there ever was a real man, Jesus.

I was surprised because I am trained as a scholar of the New Testament and early Christianity, and for thirty years I have written extensively on the historical Jesus, the Gospels, the early Christian movement, and the history of the church’s first three hundred years. Like all New Testament scholars, I have read thousands of books and articles in English and other European languages on Jesus, the New Testament, and early Christianity. But I was almost completely unaware—as are most of my colleagues in the field—of this body of skeptical literature.

I should say at the outset that none of this literature is written by scholars trained in New Testament or early Christian studies teaching at the major, or even the minor, accredited theological seminaries, divinity schools, universities, or colleges of North America or Europe (or anywhere else in the world). Of the thousands of scholars of early Christianity who do teach at such schools, none of them, to my knowledge, has any doubts that Jesus existed. But a whole body of literature out there, some of it highly intelligent and well informed, makes this case.

These sundry books and articles (not to mention websites) are of varying quality. Some of them rival The Da Vinci Code in their passion for conspiracy and the shallowness of their historical knowledge, not just of the New Testament and early Christianity, but of ancient religions generally and, even more broadly, the ancient world. But a couple of bona fide scholars—not professors teaching religious studies in universities but scholars nonetheless, and at least one of them with a Ph.D. in the field of New Testament—have taken this position and written about it. Their books may not be known to most of the general public interested in questions related to Jesus, the Gospels, or the early Christian church, but they do occupy a noteworthy niche as a (very) small but (often) loud minority voice. Once you tune in to this voice, you quickly learn just how persistent and vociferous it can be.

Those who do not think Jesus existed are frequently militant in their views and remarkably adept at countering evidence that to the rest of the civilized world seems compelling and even unanswerable. But these writers have answers, and the smart ones among them need to be taken seriously, if for no other reason than to show why they cannot be right about their major contention. The reality is that whatever else you may think about Jesus, he certainly did exist.

Serious historians of the early Christian movement—all of them—have spent many years preparing to be experts in their field. Just to read the ancient sources requires expertise in a range of ancient languages: Greek, Hebrew, Latin, and often Aramaic, Syriac, and Coptic, not to mention the modern languages of scholarship (for example, German and French). And that is just for starters. Expertise requires years of patiently examining ancient texts and a thorough grounding in the history and culture of Greek and Roman antiquity, the religions of the ancient Mediterranean world, both pagan and Jewish, knowledge of the history of the Christian church and the development of its social life and theology, and, well, lots of other things. It is striking that virtually everyone who has spent all the years needed to attain these qualifications is convinced that Jesus of Nazareth was a real historical figure. This is not a piece of evidence, but if nothing else, it should give one pause. In the field of biology, evolution may be “just” a theory (as some politicians painfully point out), but it is the theory subscribed to, for good reason, by every real scientist in every established university in the Western world.

Still, as is clear from the avalanche of sometimes outraged postings on all the relevant Internet sites, there is simply no way to convince conspiracy theorists that the evidence for their position is too thin to be convincing and that the evidence for a traditional view is thoroughly persuasive. Anyone who chooses to believe something contrary to evidence that an overwhelming majority of people find overwhelmingly convincing—whether it involves the fact of the Holocaust, the landing on the moon, the assassination of presidents, or even a presidential place of birth—will not be convinced. Simply will not be convinced.

And so, with Did Jesus Exist?, I do not expect to convince anyone in that boat. What I do hope is to convince genuine seekers who really want to know how we know that Jesus did exist, as virtually every scholar of antiquity, of biblical studies, of classics, and of Christian origins in this country and, in fact, in the Western world agrees. Many of these scholars have no vested interest in the matter. As it turns out, I myself do not either. I am not a Christian, and I have no interest in promoting a Christian cause or a Christian agenda. I am an agnostic with atheist leanings, and my life and views of the world would be approximately the same whether or not Jesus existed. My beliefs would vary little. The answer to the question of Jesus’s historical existence will not make me more or less happy, content, hopeful, likable, rich, famous, or immortal.

But as a historian I think evidence matters. And the past matters. And for anyone to whom both evidence and the past matter, a dispassionate consideration of the case makes it quite plain: Jesus did exist. He may not have been the Jesus that your mother believes in or the Jesus of the stained-glass window or the Jesus of your least favorite televangelist or the Jesus proclaimed by the Vatican, the Southern Baptist Convention, the local megachurch, or the California Gnostic. But he did exist, and we can say a few things, with relative certainty, about him.