Deity
 Different religions believe in different deities. Since there are many religions in the world there are many different ideas about how many deities there are, what they are, and what they can do. Followers of many ancient religions and some modern religions believe in many deities. The belief in more than one deity is called polytheism. The two largest religions on earth, Christianity and Islam, believe in only one God, which is called monotheism. Deism is the belief that a deity exists, but that the deity seldom or never intervenes in the universe.