Satan does have power and people usually "scoff" at the possibility that he even exists. Many people believe in God, but will not believe that Satan is a real being who torments, deceives and leads people away from God. We caught a glimpse as to how he works when we see him lying to Adam and Eve in the garden and when he temps Jesus in the wilderness. His purpose is to align as many people with him to spend eternity with him and his followers. He is, and has been, in competition with God trying to gain power over creation. It is just not politically correct these days to believe in the little red man with horns and a tail that rules over "Hades" or Hell. But as we see the effects in people's lives and the devolution of society, he is real and he tells lies and brings the proposition to everyone he contacts that they should not believe God, but instead fall down and worship him and he will reward you. His reward is separation from the God of Creation and an eternity of torment with Satan.