I mean that's still all historical speculation and using a statement from the Bible as anything other than a statement of the obvious since the Christian mythos require a death and resurrection seems dubious. It's very possible that none of it happened. I mean it seems most likely that there was an individual named Jesus who preached as there were many like him in that period in that era, which can be verified by other historical sources and works. It doesn't seem unlikely that one eventually came to dominate and win the imaginations of people, especially of the poor and oppressed who needed something better was going to happen down the line just to keep going and bring a little happiness to them. Then you have the springboard for a full blow religion. Another way is to conquer vast swathes of land and force people to accept your religion and that seems to be the more tried and true method down through the ages by all of the current major religions.