Satan disguised as Gabriel, the Angel, and told Mary to kill Jesus. Jesus was killed, and later on, Satan took control of Heaven, still disguising as Gabriel. Over the next centuries, he introduces alternate’s, or doppelgängers. These are creatures that use physiological, or mental, forms of warfare. They can only be detected based solely on appearance. They either look normal, or have physically impossible characteristics. In short, Satan tricked God. Satan is VERY manipulative.