Synonyms of irreligious

2 Syllables
sinful, impious, heathen, pagan, wicked, faithless, godless
3 Syllables
agnostic, unholy, free-thinking, ungodly, unblessed, blasphemous, undevout, atheistic, profaning
4 Syllables
non-believer, unhallowed, irreverent, sacrilegious, unbelieving, unsanctified
5 Syllables
iconoclastic, unconsecrated