infidel > define

noun

• A person who does not acknowledge your god.
  • synonyms: heathen, pagan, gentile

• (a.) Not holding the faith; -- applied especially to one who does not believe in the inspiration of the Scriptures, and the supernatural origin of Christianity.
• (n.) One who does not believe in the prevailing religious faith; especially, one who does not believe in the divine origin and authority of Christianity; a Mohammedan; a heathen; a freethinker.