Significant effort has gone into understanding and promoting racial diversity in congregations. Still, uniting worshippers of different races remains a challenging endeavor. Even congregations that successfully attract worshippers of different races often have difficulty sustaining their multiracial composition. This study contributes to the discussion of race and religion by examining racial group differences in belonging and participation in congregations. Drawing on organizational ecology theory, we develop four hypotheses to test whether and how racial group size corresponds to congregational commitment. Results of multilevel modeling using 2001 U.S. Congregational Life Survey data reveal that those who are a part of a congregation's largest racial group possess a stronger sense of belonging and participate at a deeper level than congregants of other races. Moreover, differences in belonging and participation by racial group persist regardless of group size.