Synonyms and related words :
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