When historians accept that there was a historical Jesus, what that really means is that there isn't really any evidence either way, and it's not too farfetched that there was a rabbi named Yeshua ben Yosef who pissed off the Romans, and hey, if there's smoke there must be fire, right?

Even if there was a real Yeshua ben Yosef, Rebel Rabbi, they don't think that he was raised from the dead, or that he said most of what the Bible he said.