I think Lemmy has a problem with history in general, since most people on here have degrees/training in STEM. I see a lot of inaccurate “pop history” shared on here, and a lack of understanding of historiography/how historians analyze primary sources.
The rejection of Jesus’s historicity seems to be accepting C S Lewis’s argument - that if he existed, he was a “lunatic, liar, or lord,” instead of realizing that there was nothing unusual about a messianic Jewish troublemaker in Judea during the early Roman Empire.
That’s the thing though —you shouldn’t need convincing that he wasn’t real. You should need convincing the he was real. I don’t have any particular reason to doubt he existed, but equally I don’t have a good reason to believe it either, so I just don’t. That’s the default position.
I don’t need to doubt he existed to also not hold a belief that he did.