Agnostic, atheist, infidel, skeptic refer to persons not inclined toward religious belief or a particular form of religious belief. An agnostic is one who believes it impossible to know anything about God or about the creation of the universe, or who refrains from commitment to any religious doctrine because of a lack of knowledge about God or the creation of the universe. An atheist is one who does not believe in or denies the existence of a deity or of divine beings. Infidel means an unbeliever, especially a nonbeliever in Islam or Christianity, and is often disparaging and offensive, in contrast to atheist and agnostic, which are often used in self-identification. A skeptic doubts and is critical of all accepted doctrines and creeds; while a person may self-identify in this way, the term can also be applied by others.

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