God is Satan: Satan is God of this World.
If a God created existence it must thereby extension be the source of everything which is considered to be good, and everything which can be considered to be evil. Therefore it only stands to reason that the only God to have created existence is Satan and only Satan alone. Satan is the source of everything that exists, and he is everything he created in manifestation to his own divine will. So Satan is God and God is Satan. Everything in existence is the manifestation of Satan's will. Therefore everything in existence is Satan and Satan is everything which exists which is the manifestation of Satan's will.
Isaiah 45:7 "I form the light and create darkness, I create peace and evil. I the Lord do all these things."