Devotee
From BiblePortal Wikipedia
Charles Buck Theological Dictionary [1]
In the primary sense of the word, means a person wholly given up to acts of piety and devotion; but it is usually understood, in a bad sense, to denote a bigot, or superstitious person.
Webster's Dictionary [2]
(n.) One who is wholly devoted; esp., one given wholly to religion; one who is superstitiously given to religious duties and ceremonies; a bigot.