Atheist

n. one who believes that God does not exist

Atheism, as a philosophical view, is the position that either affirms the nonexistence of gods or rejects theism. When defined more broadly, atheism is the absence of belief in deities, alternatively called nontheism. Although atheism is often equated with  irreligion, some religious philosophies, such as secular theology, or some varieties of Theravada Buddhism, lack belief in a personal god.
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Noun
1. someone who denies the existence of god
(hypernym) disbeliever, nonbeliever, unbeliever
Adjective
1. related to or characterized by or given to atheism; "atheist leanings"
(synonym) atheistic, atheistical
(pertainym) atheism, godlessness

n. atheist, one who believes that God does not exist

n. atheist, one who believes that God does not exist