This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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

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

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

n. 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.

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

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

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

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

n. 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   

irreligionist    materialist    atheist   

infidel    doubter    skeptic    disbeliever    freethinker    heretic    miscreant    misbeliever    minimifidian    nullifidian   

deist    sceptic    blasphemers    perjurer    idolater    atheist    redresser    topcoat    infidel    skeptics