Heretic /(?)/

Her·e·tic

Heretic

n.
  1. One who holds to a heresy; one who believes some doctrine contrary to the established faith or prevailing religion.
    A man that is an heretic, after the first and second admonition, reject.
    — Titus iii. 10.
  2. One who having made a profession of Christian belief, deliberately and pertinaciously refuses to believe one or more of the articles of faith “determined by the authority of the universal church.” (R. C. Ch.)