believer
noun
[ bɪˈliːvə ]
• a person who believes in the truth or existence of something.
• "a firm believer that party politics has no place in local government"
• an adherent of a particular religion; someone with religious faith.
• "the relationship into which God invites believers"
Similar:
devotee of,
adherent of,
disciple of,
follower of,
supporter of,
upholder of,
worshipper in,
convert,
proselyte,
neophyte,
bhakta,
born-again,