a person who regularly receives Holy Communion

believer

a person who is very interested in something

ardent supporter; fan

a follower of any leader of religious thought, art, learning etc (especially one of the twelve personal followers of Jesus Christ)

believer, follower

a person with a strong interest (in sports, games etc)

person active in interest

supporter; admirer

person who believes or has great interest

a person who worships

believer