the.com/apostate
Someone who quit the faith hard enough to make a formal exit interview feel inadequate.
means A person who abandons or renounces a religion, cause, or set of beliefs they once held.
from From Greek apostates, a deserter or rebel, literally one who stands away from where loyalty placed him.
Not just religionApplies to abandoned political or ideological causes too.
Apostasy capitalStill legally punishable by death in several countries.
Famous defectorRoman emperor Julian dropped Christianity for old gods.