here ' s when we explain how this worksMAAAAGIIIIIC . <| sep |> I ' m not entirely sure what the context is for satan in Christianity , but I will happily explain him , so that you can compare him to how he is in Judaism and Islam . In Christianity , Satan used to be an angel , known as Lucifer , who rebelled against God with many other angels . These angels were thrown out of Heaven and became the devil and his demons . Satan is then identified with the serpent in Genesis who leads to the Fall of Man a core Christian doctrine . Satan is also seen as the great deceiver and seeks only to lead people away from God . In the Book of Revelation , which is a kind of prophetic book , it talks about Satan ' s final defeat at the hands of God , and he is cast into the Lake of Fire and can never influence the world again . Much of the stereotypes about satan we have in Christianity come from texts like Paradise Lost and the Divine Comedy , which although have some basis in our theology , are not authoritative or always true , as they are first and foremost works of fiction .