Leo,
Your analysis is fascinating. I'd like to add something concerning the Greek idea that each god or goddess of Olympus was in fact the same deity as each god or goddess served in other countries. There is some reason to think that, in a sense, the Greeks were correct about this, because there were some deities who really had a lot in common, suggesting that they shared common origins in the Mediterranean culture. You equated Zeus with Baal and Osiris. Well, in the northern kingdom, Baal and Yahweh were identified early in Israelite history, possibly prior to the monarchy, and in that region YHWH (Yahweh) was a storm-god, just like Zeus. However, there is even linguistic similarity between Zeus and YHWH, so I wouldn't be surprised if they were identified by sea travelers even in the second millenium BCE or early first, when the Phoenicians certainly could have made the connection between Canaanite, Egyptian, Anatolean, and Greek culture. The Greeks also identified the Egyptian goddess Neit with Athena, but Neit was served in a place called the Temple of the Bee, and there is a Hebrew heroine, called Deborah, which means "Bee". Deborah is also called Eishet Lapidot, a woman of torches, and takes comman over the stars, yet in Egypt Neit was celebrated at the festival of torches. Seems to me that Neit and Deborah stem from the same goddess from some earlier time, and it makes sense that Athena would have come from that origin as well.