a person who believes that there is no God

nonbeliever

(of) a person not of the Jewish race

nonbeliever

opposed to, showing no interest in, religion

ungodly

(not now used) (of) a person who is not a believer in any of the chief religions of the world

irreligious

concerning pantheism ( = (the belief in) the theory that God is in everything and that everything is God)

person who does not believe in an orthodox religion

having or showing contempt for God and sacred things

immoral, crude, disrespectful of religion