I would even go so far as to say Jesus was probably an actual person, who lived, and was crucified, and had a following.
I don't even believe that, personally. The evidence implies that Jesus' existence began about 100 years or so after he actually supposed to have been around. He seems concocted from a bunch of stories, many of which had been around since long before his birth and used for other messiahs/avatars of other religions.
I donno, wasn't around. (hence, usage of the "probably")
Lots of historical figures are shrouded in controversy of their physical existence. King Arthur is a good example of that.
In any case, whether real, or created - there are basically two reasons to support their existence - it was probably hard to get myths to go "viral", and people like to exaggerate tales. Therefore, I think its more likely that the person existed, and tales of grandeur were probably heaped upon the living dude, who was probably just some ultra-charismatic person.
The people who were "world-changers" during that era were already bigger than life, exalted as living gods. All your Caesar types, Alexander the Great, the Pharaohs..
I'm not arguing pro or con, remember - I'm just saying, it seems more likely
to me that there was some living person who that stuff was attributed to.
Even if it was a scam, its much harder to pull off a scam with no dude playing the role.