Ultimately, Republicans limited the benefits of Reconstruction to African Americans while further marginalizing Chinese Americans and Native Americans. In this paper, I argue that religion provided both a justification and lingua franca for excluding “heathens” from citizenship. Supported by leading African Americans, Republicans attempted to decouple hierarchies of religion and race, putting forward a new definition of citizenship based on Christian rather than white manhood. The Fifteenth Amendment, ratified in February 1870, brought a new political order to the United States. The nation’s antebellum definition of citizenship based upon racial manhood had given way to a new definition based upon religious manhood, dividing Christian and heathen men. However, this shift would encourage Chinese Americans and Native Americans to join Christian churches during the 1870s, making use of Christian theology and denominational resources in their own struggles for political voice while testing the nation’s newfound dedication to Christian male suffrage.