proselyte (n.)

• apostate
• apostle
• backslider
• believer
• catechumen
• churchgoer
• churchman
• collaborationist
• collaborator
• communicant
• convert
• defector
• deserter
• devotee
• disciple
• fanatic
• follower
• mugwump
• neophyte
• quisling
• receiver
• recidivist
• recreant
• religionist
• renegade
• reversionist
• saint
• secessionist
• separatist
• strikebreaker
• tergiversator
• theist
• traitor
• truster
• turnabout
• turncoat
• votary
• zealot