I don't believe that God broke the symmetry inherent in His creation of the universe to create legions of lesser "gods", which despite arguments for how this contributes to monotheism, I just cannot see it. Despite the plethora of reasons to believe in God, there is not a single scintilla of evidence for Satan's activities anywhere in the universe until human beings abstract the concept of evil from their own minds, leaving aside the concept of personal responsibility as opposed to "The devil made me do it". Good and evil are real, but it took human beings to able to distinguish the two.
keep thinking that