"In the entire first Christian century Jesus is not mentioned by a single Greek or Roman historian, religion scholar, politician, philosopher, or poet. His name never occurs in a single inscription, and it is never found in a single piece of private correspondence. Zero! Zip references!"
This is a quote from Bart Ehrman, but is grossly out of context. This quote is also problematic, because there are First Century historians who mentioned Jesus, but that's beside the main point here.
Here's a longer version of the quote:
A. It is obviously important for a historian to look at all the evidence. To most modern people, it is surprising to learn just how little evidence there is for Jesus outside the Christian sources. He is not mentioned in any Roman (or Greek, or Syriac, or… whatever – any pagan [i.e., non-Jewish, non-Christian]) source of the entire first century. Never. That strikes people as surprising. He is mentioned a couple of times within about 80 years of his life by two Roman sources (Pliny and Tacitus; I’m not sure Suetonius can be used). And he is almost certainly referred to twice in the Jewish historian Josephus, once in an entire paragraph. But that’s it for the non-Christian sources for the first hundred years after his death. It’s not much. But it’s something, and since these are not sources that based their views on the Gospels (since these authors hadn’t read the Gospels), it shows that Jesus was indeed known to exist in pagan and Jewish circles within a century of his life.
The really compelling evidence, though, comes in the Christian sources. Mythicists write these sources off because they are Christian and therefore biased, but that is not a historically solid way to proceed. Christian sources do indeed have to be treated gingerly, but they are sources every bit as much as pagan and Jewish sources are. What I show in Did Jesus Exist? is that there are so many Christian sources that can be used by historians that there is really no doubt at all that Jesus at least existed. Just to give an example (so as not to repeat my entire book here): by any credible dating, the apostle Paul must have converted to believe in Jesus within two or three years of the traditional date of Jesus’ death. And Paul knew some facts about Jesus’ life; he knew some of his teachings; he knew his closest disciple Peter; and he knew his brother James. Personally! If Jesus didn’t exist, you would think that his brother would know about it. The historian can not simply ignore what Paul has to say since he was a Christian. Taking his biases into account, we can use his letters for information about Jesus. And among other things, they show beyond a doubt that Jesus existed as a Jewish teacher in Palestine in the 20s CE. Otherwise we cannot explain Paul or his letters. That’s just one important piece of evidence for the existence of Jesus. I’ll discuss more in some of my later answers.
As we can see, Internet Atheists often just do not know what they are talking about. Ehrman's thrust with this quote is that Jesus most certainly DID exist, NOT the nonsensical idea that Jesus did not exist.
These are links to the original quote, and a response to Bart Ehrman. Hint: There WERE First Century historians who acknowledged the existence of Jesus.