Synonyms: believer, worshiper, worshipper
Definition: a person who has religious faith
Similar words: religious person
Definition: a person who manifests devotion to a deity
Definition: a supporter who accepts something as true
Similar words: supporter, friend, admirer, protagonist, booster, champion
Definition: a person who backs a politician or a team etc.
Usage: all their supporters came out for the game; they are friends of the library