Well, one could argue then that if there were a serpent in the garden (besides adam's) that the duality already existed, just not in humans and would have arisen anyways through the deceiving of ignorant people. Ignorance can be swayed to evil. Knowledge and understanding of evil can lead to better conscience.

God still comes off as an evil asshole, and Satan comes off as a whiny bitch who cocked things up to prove a point.