The Historical Jesus: What We Can and Can’t Know
The evidence for the historical Jesus is thinner than most people assume, but stronger than his critics admit.
Ask a historian whether Jesus existed and you’ll almost certainly get a yes. Ask what we can say about him with confidence and the conversation gets quieter fast since there’s a wide gap between “a historical figure named Jesus probably lived in first-century Galilee” and “we know what he said, did, and meant.” Most of what fills that gap is theology.
That picture doesn't hold up under scholarly scrutiny, and that includes the work of Christian scholars themselves.
Before We Begin
This topic came up in the last reader survey, and over the coming weeks I’ll be prioritizing more of the subjects you asked for. Once you’ve finished reading, don’t leave me in the void. Like it, comment on it, criticize it.
Enjoy.
The Sources Aren’t What People Think They Are
People tend to assume the Gospels function like biographies. Four independent witnesses, four overlapping accounts, and the truth sits somewhere in the middle. That picture does not parallel with what the scholars make of, that includes mostly Christian ones.
Mark was written first, probably around 70 CE, roughly four decades after Jesus’ death. Matthew and Luke both copied from Mark, often word for word, while adding their own material. John, written later still, tells a fundamentally different story with a fundamentally different Jesus. These aren’t four independent witnesses. They’re one source, two rewrites, and a theological outlier.
On top of that, none of the Gospel authors knew Jesus personally. They’re writing in Greek, for Greek-speaking audiences, about events that originally took place in Aramaic-speaking rural Palestine. We’re already two languages, two cultures, and several decades removed from whatever happened on the ground.
Paul, the earliest Christian writer we have (his letters predate the Gospels by 15-20 years), barely mentions the earthly Jesus at all, including his conception and birth. He doesn’t quote Jesus’ parables. He doesn’t reference the Sermon on the Mount. He doesn’t describe miracles. His Jesus is a cosmic figure who died, rose, and will return. The human biography doesn’t seem to interest him.
Outside the New Testament, the evidence thins to almost nothing. Jewish historian Josephus mentions Jesus twice, but one of those passages (the Testimonium Flavianum) was clearly edited by later Christian scribes to make it sound more flattering.
Roman senator and historian Tacitus mentions “Christus” in passing. Pliny the Younger describes Christian worship practices. None of these tell us much about the man himself.
Besides, neither Josephus nor Tacitus lived during Jesus’ lifetime.
What the Criteria of Authenticity Can (and Can’t) Recover
Scholars have spent the last two centuries developing tools to sift through the Gospels and extract material that might go back to the historical Jesus. The most commonly used criteria include embarrassment (things the early church wouldn’t have invented because they’re theologically inconvenient), multiple attestation (things that show up in independent sources), and dissimilarity (things that don’t match either Jewish precedent or later Christian theology).
These tools have their uses, but they’re less sophisticated instruments than they appear. The criterion of dissimilarity, for example, can only identify a Jesus who’s unlike both Judaism and Christianity, which is absurd on its face. He was a Jew, and Christianity came from his movement. Anything that sounds Jewish gets filtered out, anything that sounds Christian gets filtered out, and what’s left is a historically implausible figure with no cultural context.
The criterion of embarrassment works better in specific cases. Jesus’ baptism by John, for instance, probably happened, because it implies Jesus was subordinate to John, and that’s a claim the early church spent considerable effort trying to explain away. You can watch the discomfort grow across the Gospels: Mark reports it plainly, Matthew adds a dialogue where John protests that Jesus should be baptizing him, Luke buries it in a subordinate clause, and John’s Gospel drops the baptism scene entirely. That trajectory of increasing embarrassment is hard to explain unless the event was historical and couldn’t be erased.
But even here, the method has limits. We can recover isolated facts (he was baptized, he was from Nazareth, he was crucified under Pontius Pilate), but reconstructing his teachings, his self-understanding, or his intentions is a different matter entirely. Every saying attributed to Jesus passed through decades of oral transmission, translation from Aramaic to Greek, and theological editing before reaching the page. Separating the original signal from the accumulated noise is, in many cases, impossible.
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The Jesuses We’ve Built
It’s worth noticing how many different “historical Jesuses” scholars have produced over the years. Albert Schweitzer pointed this out back in 1906, and the observation still holds. The historical Jesus has been reconstructed as an apocalyptic prophet (Schweitzer, Ehrman, Allison), a wisdom teacher (the Jesus Seminar), a Jewish cynic philosopher (Crossan), a social revolutionary (Horsley), and a Galilean charismatic (Vermes). Each reconstruction reflects not just the evidence but the priorities of the scholar doing the reconstructing.
Arguably, the most defensible claims about the historical Jesus are also the least theologically interesting: he existed, he was Jewish, he came from Galilee, he was baptized by John, he had followers, he was crucified by Rome. Beyond those bare facts, confidence drops significantly.
What We’re Left With
Ancient history doesn’t operate the way modern history does. It’s not about what happened, it’s about what likely happened, and the evidentiary standards reflect that gap. If thirteen letters surfaced tomorrow claiming to be from Winston Churchill, none of them would make it into a history book without extensive verification, handwriting analysis, provenance checks, and corroborating documentation. Ancient history doesn’t have that luxury. The evidence is sparse, the chains of transmission are long, and the original manuscripts are gone.
That also means certainty is looser than most people realize, and that cuts both ways. No single piece of evidence is likely to change the mind of someone who’s already convinced, whether they believe Jesus existed or believe he didn’t. People on both sides tend to treat their position as settled and read the sources accordingly.
As far as professional historians are concerned, though, “didn’t exist” isn’t one of the options on the table. The question they’re asking isn’t whether Jesus was real or fictional. It’s whether the available evidence meets the threshold to consider his existence likely. For the vast majority of ancient history scholars, including non-Christian ones, the answer to that question is yes. The dispute is over what we can say about him beyond bare existence, and that’s where the real disagreements live.
Do I believe Jesus existed? If I did, I wouldn’t say yes and defend it with other people’s assessments as evidence, given ancient history always carries a subjective element, and scholars work within that space. If I didn’t, I’d have to reckon with the fact that I decided long ago I couldn’t pick and choose among scholarly consensus if that’s what I criticize creationists for doing. So even when, in my heart of hearts, I don’t agree with the scholars, to the outside world I wouldn’t defend that disagreement. Whether I believe in Jesus’ existence is a question mark to you, and it should stay that way.
What I can do is write a piece “proving” the historical Jesus or refuting him with selective evidence, and the internet is full of both. But I’d rather leave you with the honest mess.
