<< The idea that there was no Jesus is preposterous >>
That’s not the point. The point is that there is no documentary evidence of his existence other than the gospels… second-hand accounts written between 50 and 100 years later, by people writing with an obvious bias.
You want to believe in his divinity or not, that’s fine. You want to believe in his existence or not, that’s fine. But it’s the “pretending” that we’re focused on here – pretending that there is outside evidence of his existence, when there is not. That’s cheating.
Now, there’s a reason (assuming he existed) for the lack of documentary evidence. He wasn’t a king or a prince or a rich landowner who would have kept records, or about whom others would have kept records. They didn’t keep track of who was executed, those people were all riff-raff anyway, they only kept track of important people in the social strata.
Jesus’s followers repeated his words and told his stories orally, because they expected him imminent return – his death and resurrection were supposed to usher in the New Era, all the dead would arise, etc. There’d be no need to record his words, he’d be back any minute. As time went on and this expectation wasn’t met, there was an effort to write down his story before it was forgotten by the next generation (or misquoted in oral translation.)
So, the presence of independent, outside documents would be pretty conclusive evidence of his existence; but we don’t have that. The absence of such independent, outside documents is by no means conclusive (or even indicative) evidence of non-existence.
That help clarify?