Sab,
Think about this. I don't know if Jesus existed or not, I am undecided. However using your reasoning, you must consider all belief system. Ra, Ishtar, Whatever it is that Scientologists believe, Marduk, Dagon. Some gods were said to have walked the earth as humans. That's not unique to Christianity. And organizations built up over these beliefs. Wars were fought. Politics affected. But did these deities or people really exist?
And even if they did exist, is their future portrayal accurate? Oftentimes, when a powerful teacher/leader with followers dies, they become more powerful in narratives after their deaths. More followers are picked up, not based on a man they knew, but based on the these new narratives. And sometimes the original did not exist at all, but the stories are tenacious and accepted.
Just encouraging you to look at it from all angles. I have no opinion either way. He could have existed and touched many, which led to fantastical tales after his death. Or he may not have existed and is simply a personification of a belief system. Either way, the existence of these systems are not evidence.
NC