I think this is one of those debates that isn’t susceptible of definitive resolution. For what it’s worth, I think the Jesus story is based upon an actual man, but that he was a charismatic, half-mad, small-bore cult leader who lucked into some good publicists after he died.
The takeaway is this: Bart Ehrman and Richard Carrier are both accomplished, serious-minded historians specialized in the Biblical era — and they can’t even agree on whether or not there was such a man as Jesus. Remember this next time some yahoo gets to howling that he knows this and knows that because the Bible tells him so.
No. He doesn’t. It isn’t even certain that Jesus ever lived.