This article generally deals with the relationship between religion and identitiy. First part of the article draws theoritical framework of the topic. Second part deals with the identitiy as a problem in Sociology of Knowledge. Third part deals with the religion as a medium of identitiy. Fourth part deals with the practical indicators of the topic. In this context we deal with the modern and  postmodern identities and identitiy crises in social institutions.Article ends with conclusion.