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 a common misunderstanding/simplification. It’s more “wow, these gods are kinda similar to ours, so they must be the same.” Portable Orange on YT has a good and well sourced video, and I think reading Dr. Devereaux’s blog posts is a good way to understand some ideas about ancient polytheism. Neither of these are published journal articles or books, but they both thoroughly cite their sources.