adjective

believing in or practising religious heresy.

heretical beliefs

dissident,dissenting,nonconformist,unorthodox,heterodox,apostate,freethinking,iconoclastic,schismatic,renegade,sceptical,agnostic,atheistical,non-theistic,non-believing,unbelieving,idolatrous,pagan,heathen,impious,separatist,sectarian,revisionist,recreant,recusant,nullifidian,paynim