noun. One who lacks belief or faith, especially in a particular religion; a nonbeliever.

noun. An incredulous person; one who does not believe.

noun. One who discredits Christian revelation, or the mission, character, and doctrines of Christ.

noun. One who does not believe in or hold any given religion.

noun. Synonyms Skeptic, Disbeliever, etc. See infidel.

noun. One who does not believe; an incredulous person; a doubter; a skeptic.

noun. A disbeliever; especially, one who does not believe that the Bible is a divine revelation, and holds that Christ was neither a divine nor a supernatural person; an infidel; a freethinker.

noun. One who does not believe, particularly in a deity (used by believers to describe other people)

noun. someone who refuses to believe (as in a divinity)

"I guess the difference between a believer and an unbeliever is that an unbeliever doesn't understand how a believer thinks or how prayer or personal revelation works."

believer  

nonreligious person  

atheist  irreligionist  materialist  

adulterer  apostate  atheist  blasphemers  deist  

Pyrrhonist  Sabbath-breaker  apostate  atheist  backslider