When people of faith participate in movements for social change, how are their religious and moral identities formed, challenged, and transformed? Although they have explicit and tangible goals as they participate in advocacy, protest, and boycotts, religious social activists also, James Jasper argues, craft "lives worth living" (1997). This article examines the identity-shaping power of religious participation in social movements, in conversation with scholarship in religious education and social movement theory; describes the relationship between social activism and theological imagination; and proposes some explicit practices for nurturing religious and moral formation.