(n.) One earnestly devoted or attached to a religion; a religious zealot.

Brahman Buddhist Christian God-fearing man Holy Willie Joseph Surface Mawworm Pecksniff Pharisee Tartuffe accepter affecter anthroposophist believer canter canting hypocrite catechumen churchgoer churchite churchman communicant convert cultist daily communicant devotee devotionalist disciple dissembler dissimulator fanatic follower formalist good Christian hypocrite ist lip server lip worshiper neophyte pharisee pietist pious fraud poser proselyte ranter receiver religioner religious hypocrite saint sniveler snuffler spiritual humbug theist truster votary whited sepulcher zealot