In Middle Eastern (aka Islamic) mythology, when god created Adam, he expected all the angels to bow down before Adam. The angel, Iblis, refused to do so. Therefore, Iblis was cast out of paradise. He became the Devil, or Shaitan, who was determined to tempt humankind and make their life miserable on earth. His aim was to prove to god that his creation was faulty and that god's anger on him was misplaced.