Apostacized is a word that indicates someone has abandoned or renounced a religious or political belief, and its antonyms include "committed," "faithful," "devoted," "loyal," and "dedicated." These words all suggest a sense of conviction and steadfastness in one's beliefs, and a refusal to waver in the face of external pressures or temptations. Unlike apostacized, which implies a sense of betrayal or disloyalty, these antonyms connote a sense of faithfulness and devotion to one's beliefs or cause. In sum, while apostacized represents a lack of commitment or conviction, its antonyms indicate a steadfastness and commitment to one's beliefs, values, and principles.