Please, give us a link to a credible source that proves Jesus existed.<quoted text>Jesus? He's no myth rather recorded historic fact. Get over it. Your caveman? Not so much.
Your second claim is even more far-fetched for there is tons of proof for the existence of the homo erectus and so on. It is not a belief, it is history, based on facts.
If you can't back yourself up when asked for sources, you obviously have no fact behind your claims. So be careful as to what your response is.
(Though I bet you'll just invalidate yourself like everyone else.)