This article contends that Brazil's evangelical Christian networks increasingly function as penal infrastructure. Since the 1990s, the scale and scope of evangelical involvement in the criminal justice system have grown significantly. One clear result is that the capillary relationships that constitute Christian community now mobilise resources to support or even substitute the basic functions of punishment. I draw on fieldwork in Rio de Janeiro to understand this shift and its broader implications for the Brazilian project of incarceration. I also make a general claim for thinking with and through infrastructure as a pathway to understand penal governance.