infidel

literally "one without faith," "infidel" is an offensive word, especially when used for a Christian or Muslim. When used by a Muslim, it means "one who denies the blessings of God" and refers to all non-Muslims. However, because the term is considered derogatory and because the Koran commands its followers to use kind words, it is a punishable offense for Muslims to use "infidel" to denote a Jew or a Christian. In Roman Catholicism, it refers to someone who doesn't believe in the divinity of Jesus or one who has not been baptized.