God is supposed to be omnipotent. You know, all powerful, almighty. The great-making characteristics of such a god are the paragon of abilities. He could achieve anything at the metaphorical click of his fingers.
So what the hell is Satan still doing hanging around? Well, of course, he doesn’t exist either. But supposing you believe that both God and Satan are real entities. Well, then, you’d be making no sense at all. Recently on The Big Questions on the BBC they were discussing whether the Devil was real, symbolic or non-existent. A good proportion of the audience advanced different theories on Satan’s ontological reality and this kind of annoyed me. It seems to me that such people couldn’t argue their way out of a paper bag. 
God could make Satan disappear, non-existent, at the click of his fingers. Any ontological argument for God, or claim that he is perfect, such as under Perfect Being Theology, argues for God’s supreme omni-abilities. To be the greatest being in conception, there can be no rival being as God could dispense with them on a whim.
This means that if the Devil exists, he does so on the behest of God. Either God actively wants him to exist, or his disappearance would cause more grief than good, like some embodiment of the Problem of Evil.
Thus it appears that Satan, if he exists, is doing a job for God; providing a service, if you will. God, then, must accept corporate responsibility for him. In other words, anything that is laid at the feet of Satan, in terms of blame and moral responsibility, should actually be laid at the invisible feet of God. God allows (either by design, direct causation or act of omission) everything that Satan does.
Which renders the whole thing rather silly and nonsensical.
