'Satam' was Enlil's title, in Sumerian in means 'Administrator' while Enki's title was Yahwerh. Enlil wanted to wipe out early man but Enki rebelled because he didn't want his great work destroyed. Genesis is largely a re-write of the Enuma Elish so if you're serious about understanding this have a look through the history books.

Demons didn't come into existence until much later, with the control mechanism that was the Roman Catholic church at the time. They invented demons and saints to keep people under their control and the superstitious people at the time bought into it through fear, they didn't want the bogey man to get them and the saints looked the part with armour, shields and the like.

Demons as a force of consciousness are avatars of the collective unconsciousness initially then a demonised ego, in a "The demon drink made me do it" kind of thing. Good versus evil has been around a long time, and of course there needed to be agents of both good and evil for them to happen - something needed to do both good and bad things.Really they're personifications of the human psyche.

It's nice to see some traditions haven't been forgotten.