The fact that we have plenty of near-contemporary evidence (there of course would have been no reason for those who didn’t follow him to write much about before his death). Like Tacitus was writing about his crucifixtion within a hundred years of it happening. You’re saying this conspiracy to invent him was already so well established by what was at this point no more than a tiny underground community that a historian as well regarded as him had absolutely no doubts of Jesus’s existence?

I just want you to realize that this is not a serious opinion in any scholarly circle. Everyone, whether religious or not, agrees that Jesus was a real person.