human, individual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"

agnostic, doubter - a person who doubts truth of religion

blasphemer - a person who speaks disrespectfully of sacred things

deist, freethinker - a person who believes that God created the universe and then abandoned it

disbeliever, nonbeliever, unbeliever - someone who refuses to believe (as in a divinity)

gentile, heathen, infidel, pagan - a person who does not acknowledge your God

nihilist - someone who rejects all theories of morality or religious belief

positivist, rationalist - someone who emphasizes observable facts and excludes metaphysical speculation about origins or ultimate causes