THESAURUS
atheistic
apostate, atheist, backsliding, blasphemous, disbelieving, faithless, fallen, fallen from grace, gentile, goyish, heathen, impious, infidel, infidelic, irreligious, irreverent, lapsed, minimifidian, misbelieving, non-Christian, non-Jewish, non-Mohammedan, non-Mormon, non-Moslem, non-Muhammadan, non-Muslim, nullifidian, pagan, profanatory, profane, recidivist, recidivistic, recreant, renegade, sacrilegious, unbelieving, unchristian, uncircumcised, undutiful
ROGET THESAURUS
atheistic
Irreligion
N
irreligion, indevotion, godlessness, ungodliness, laxity, quietism, skepticism, doubt, unbelief, disbelief, incredulity, incredulousness, want of faith, want of belief, pyrrhonism, bout, agnosticism, atheism, deism, hylotheism, materialism, positivism, nihilism, infidelity, freethinking, antichristianity, rationalism, neology, atheist, skeptic, unbeliever, deist, infidel, pyrrhonist, giaour, heathen, alien, gentile, Nazarene, espri fort, freethinker, latitudinarian, rationalist, materialist, positivist, nihilist, agnostic, somatist, theophobist, irreligious, indevout, undevout, devoutless, godless, graceless, ungodly, unholy, unsanctified, unhallowed,
atheistic, without God, skeptical, freethinking, unbelieving, unconverted, incredulous, faithless, lacking faith, deistical, unchristian, antichristian, worldly, mundane, earthly, carnal, worldly minded, irreligiously.