In New York, one who does not believe in the Christian religion; in Constantinople, one who does. (See

Not holding the faith; -- applied by Christians to one who does not believe in the inspiration of the Scriptures, and the supernatural origin of Christianity; used by Mohammedans to refer to those who do not believe in Islam.

One who does not believe in the prevailing religious faith; a heathen; a freethinker; -- used especially by Christians and Mohammedans.

Any one having a strong adversity to Christianity. (MEDIEV-L. Medieval Terms)

a person who does not believe in your particular religion, denomination or religious tradition. Similar to "Unbeliever" but more of a "snarl" word.

an unbeliever

a person who does not believe in a particular given religion

A person who does not believe in any particular religious system.

An infidel (literally, "one without faith") is one who doubts or rejects central tenets of a religion, especially those regarding its deities. More generally, an infidel is one who doubts or rejects a particular doctrine, system, or principle. The word infidel derives its meaning from the Latin root infidēlishttp://dictionary.reference.com/search?q=infidel; a notion of being unfaithful or treacherous.