Almost every story in Christianity has roots and themes that date back to far more ancient religions. This isn't news (though yours is still incorrect).

I heard that Satan went back in time and made up fake messiahs to fool us into being atheists.

While he was there, he planted the dinosaurs in the ground and aged the Earth.

But... but... jesus (not myself of course) is real and....

While this is a very interesting topic, there's an easy answer:

The early church couldn't help to borrow from pre-existing beliefs in order to expand. The fact early popes borrowed myths in order to pad their own mythology doesn't change that Jesus was indeed the Son of the only God.

My God is better than your God. Go away.

even the pages you linked to strongly suggest that this "copycat" isn't correct. Just read the entire second link. I mean seriously, I can find similarities in all sorts of things, but that doesn't mean they are related.

If your father really loves you more, what about the other families? _{-Tomas Kalnoky}

Obviously obvious, their fathers don't love them as much.

Sucks for them.