Infidel

Webster's Dictionary of the English Language

·adj Not holding the faith;

— applied ·esp. to one who does not believe in the inspiration of the Scriptures, and the supernatural origin of Christianity.

II. Infidel ·noun 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.