Brad R. Fulton and Richard L. Wood’s chapter uses a national dataset of faith-based community organizing (FBCO) coalitions to provide an overview of an organizational field that is central to the progressive religious activist field as a whole. The chapter focuses on the high levels of religious diversity, racial/ethnic diversity, and socioeconomic diversity of the FBCO field, and argues that these groups draw on shared religious commitments to bridge their racial/ethnic and socioeconomic divides. Finally, they argue that in addition to the sheer scale of mobilization enabled by the FBCO infrastructure, this diversity constitutes faith-based organizing’s most significant source of power and most important credential for legitimacy in the public arena.