I'm still not completely sure if the Devil is even a truly bad guy, the Devil if anything sharpened Jesus in his 40 day trial. The duality I'm talking about is like Batman/Joker (especially the Dark Knight depiction) and the 2 brothers from the TV show Lost. The Devil is kinda useful honestly, it's pure raw sexual energy and it creates life.
I think what's really frightening are those who are self-serving. They plead no allegiance to God or the Devil, but they seek and live to only please their desires at any cost; those who walk on Earth as if they are the Gods. Khazars sacrifice to Moloch and have their own Gods, are they even related to the Devil?
Anyways just food for thought, I'm still trying to figure it all out like anyone else.