Half Banana,
What interesting thoughts you present. The history of the Ancient Hebrews is one of borrowing myths, ideas, and gods from their neighbours. They did not live in isolation. YHWH was taken from their neighbours ("Yahweh and the Gods and Goddesses of Canaan", Day) along with the wife of EL, named Asherah ("When God was a Woman", Stone; "The Hebrew Goddess", Patai; "Did God Have a Wife?", Dever; etc).
As for books dealing with that Roman period: "Jesus Wars", Jenkins; "A New History of Early Christianity", Freeman; "AD 381", Freeman. But I am no aware of any books that precisely focus on listing all the antecedent pagan and Gnostic influences, although it is regularly pointed out that Paul's ideas were deeply influenced by his Hellenistic environment.
Doug