In the Middle Ages, Satan played a minimal role in Christian theology and was used as a comic relief figure in mystery plays. During the early modern period, Satan's significance greatly increased as beliefs such as demonic possession and witchcraft became more prevalent.
During the Age of Enlightenment, belief in the existence of Satan became harshly criticized. Nonetheless, belief in Satan has persisted, particularly in the Americas.
In the Quran, Shaitan, also known as Iblis, is an entity made of fire who was cast out of Heaven because he refused to bow before the newly-created Adam and incites humans to sin by infecting their minds with waswās ("evil suggestions"). Although Satan is generally viewed as evil, some groups have very different beliefs.