Proselyte
PROS'ELYTE, noun [Gr. to come.] A new convert to some religion or religious sect, or to some particular opinion, system or party. Thus a Gentile converted to Judaism is a proselyte; a pagan converted to christianity is a proselyte; and we speak familiarly of proselytes to the theories of Brown, of Black, or of Lavoisier. The word primarily refers to converts to some religious creed.
PROS'ELYTE, verb transitive To make a convert to some religion, or to some opinion or system.