Remember when Zeus turned himself into a Swan and impregnated a virgin woman? Yep it was borrowed by Judaism and passed down to Christianity. Now there are people who claim this myth as actually referring to UFO aliens conducting breeding experiments on man.

Remember when Ossirus was killed and then resurrected piece by piece?
Yep resurection has been borrowed by later faiths as well.

Most successful religions incorporate a prior myth into their new belief system.