Well I know Horus deposited his... erm... semen into some of Set's food to establish dominance.
I'm not making that up, that's entirely true within Egyption lore. I don't remember Jesus doing anything like that xD
As for me, I have no idea whether or not jesus actually existed, to me it seems irrelevant. What we do know is someone existed to tell the tale, whether it be Jesus or someone else.