Where does Greek mythology come from?

Probably conversations between Goliath, who descended from a mixed race of giants, and the Philistines. So before, I concluded Philistines were originally Greeks. They sailed from Greece to the land between Africa and the holy land where they settled as farmers: the Jewish shepherd/farmer conflict.

Their champion was Nephilim who was also a soothsayer; these giant tales were the Greek experience from Gaza, not indigenous Aegean like Socrates or other Greek masters. And Hellenistic feats were far removed from Alexander of Macedon.

So Hercules and Achilles were leftover Nephilim experiences passed down through the world conquering cultures of Babylon, Persia and finally sanitized, anesthetized by Rome. Homeric encounters between cyclops and Ulysses were echoes of the David/Goliath past.