The reduction Jesus doesn’t even work. Even if you reduce him down to some guy named Jesus who pissed the Romans off you wouldn’t be able to account for the community that popped up. Additionally you still can’t prove that this diet Jesus event happened, you just lowered the claim so much that it is not plausible instead of impossible.

What does explain the the community would be deliberate fraud. A cult lead by James and Peter about an mythical being.