Sentence:  Religious faith can be considered a necessary condition of membership in a <WSD>congregation</WSD> , since the decision to join a worshiping group requires some motive force , but faith is not a sufficient condition for joining ; the presence of other members of similar social and economic level is the sufficient condition . 
Meaning of the word marked with <WSD> tags:  a group of people who adhere to a common faith and habitually attend a given church