Will you please go and look for the meaning of word myth.
myth:A fiction or half-truth, especially one that forms part of an ideology.(The American Heritage? Dictionary of the English Language)
All these cultures you are talking about had some idea that a man having virgin birth will be born to redeem the world.But these people rejected the true God but still got this idea from their ancestors who knew the coming of the redeemer.As all the people descended from adam I believe that adam told all this to his children.But some of his children rejected God and formed their own beliefs with the passage of time.However this knowledge of the coming of the redeemer remained in thier culture and hence influenced their religious views.
in the book of genesis God tells the serpent that He will put enemity between his seed(satan) and the woman`s seed.Her seed will crush your head and you will strike his heel.The woman has no seed.(The seed is in the man and not in the woman and woman is the land).Seed comes from a man.so this verse shows that one who will crush the satan`s authority will be born out of a woman without the assistance of man.read genesis 3:15 (kjv)
