Sabbath-breaker, apostate, apostatize, atheist, atheistic, backslider, backsliding, blasphemer, blasphemous, bolter, collaborationist, collaborative, collaborator, convert, defect, defector, degenerate, desert, deserter, disloyal, faithless, fallen, fallen from grace, fifth columnist, heretic, heretical, iconoclast, impious, insurgent, irreligious, irreverent, lapsed, mugwump, perfidious, profanatory, profane, proselyte, quisling, rat, rebel, recidivist, recidivistic, recreant, renegado, renegate, renege, reversionist, runagate, sacrilegious, sacrilegist, schismatic, seceder, secessionist, separatist, strikebreaker, tergiversant, tergiversating, tergiversator, traitor, traitorous, treacherous, treasonable, treasonous, turn against, turn traitor, turnabout, turncoat, turntail, unbeliever, undutiful