adjective

not believing in God.

a sceptical, godless society

atheistic,unbelieving,non-believing,non-theistic,agnostic,sceptical,heretical,faithless,irreligious,ungodly,unholy,impious,profane,infidel,barbarian,barbarous,heathen,heathenish,idolatrous,pagan,satanic,devilish,fiendish,demonic,diabolical,infernal,nullifidian