He was a Roman invention and part of a propaganda campaign by the Roman elite to chill out the Jews looking for their Messiah. Think about some of the things he promoted, "turn the other cheek", "PAY CAESARS THINGS TO CEASAR" ie pay your taxes.
He was almost certainly 100% made up
And while some people dispute this "conspiracy" which is actually harder to believe? that or that God knocked up a Jewish virgin, she has a son who finds his super powers around 30, creates a massive stir in the Roman empire and amongst the Jews there with almost no source to confirm it outside some stories written 100 years later with no origins to be found he is killed, comes back to life, leaves to heaven, says he's coming back and doesn't. yes that sounds much more viable.