If you don't tie the account of the Garden to known history/Archaeology of the time, you can make it say anything. There is an "adultery" component to this story, but it seems to be related to the use of the priestesses/temple prostitutes back then. The original posts were using the greek mythology, which was good. The serpent seemed most closely related to Python, the serpent God that lived underground (eating dust.) Since the Bible equates false Gods with Demons, the later association of the serpent with Satan is appropriate.