The Proselyte reference article from the English Wikipedia on 24-Apr-2004
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Proselyte

A proselyte (from the Latin word proselytus which in turn comes from the Greek word πϱοσήλυτος, proselytos meaning "someone who has found his/her place") is in general a title given to a person who has switched totally to embrace a certain religion, world view, ideology, metaphysics, ontology et cetera. It is used especially to signify people who try to convert others to his/her cause in an obtrusive and irritating manner.

In the traditional sense like in proselytism this word signified people who have converted to Judaism, but is nowadays used for people who have "seen the light" some way or another.

See also: golden hammer