apostate
noun
[ əˈpɒsteɪt ]
• a person who renounces a religious or political belief or principle.
• "after fifty years as an apostate he returned to the faith"
Similar:
dissenter,
heretic,
nonconformist,
defector,
deserter,
traitor,
turncoat,
schismatic,
recusant,
recreant,
renegade,
tergiversator,
apostate
adjective
• abandoning a religious or political belief or principle.
• "an apostate Roman Catholic"
Origin:
Middle English: from ecclesiastical Latin apostata, from Greek apostatēs ‘deserter, runaway slave, apostate’.