I haven’t really heard that Jesus of Nazareth didn’t exist as an argument against Christianity, just that he wasn’t God and didn’t to miracles/resurrection. There is a ton of exaggeration in all mythology texts, and some are just stories to illustrate a point. But of those that did have factual events, they are rarely a true telling.

Can you be more specific here? What are factual events? Are you referring to the Bible? Which events specifically?

Because my understanding is that the consensus among historians is that there’s only like one or two references to a “Jesus of Nazarath” outside of the Bible (Josephus being the main one, and even that is super vague).

The honus is on your to prove that he existed, not the other way around.