As fictitious superheroes go, Jesus isn't all that: Tell people to be nice, piss off the authorities, get yourself hung. Unimaginative, badly written, self-promoting. The only remarkable thing about Jesus is the number of idiots who have killed and died in his name.
So, you don't know whether the alleged miracles are fact or fiction but you nevertheless cite miracles among the criteria for deeming him the "best". Sounds like it doesn't matter to you whether any of it's true, in which case there are dozens of fictional heroes and quite a lot of real ones who fit the bill.