In the aftermath of World War II, eugenics and the pseudoscientific base used to justify its practices are generally understood to have phased off the scene. If, however, eugenics never actually disappeared but has been persistent, and in turn becomes one of the best explanations for mass incarceration today, what role did Christianity—especially Evangelicalism—play in this unprecedented moment of imprisonment? Building on legal scholarship identifying the significant role of eugenic philosophy that manifests in penal policy and ongoing phenomena into the early twenty-first century, this article examines key figures in the backdrop of eugenics’ particular early developments, and leading figures—namely, Billy Graham and Prison Fellowship’s Chuck Colson—whose ministries operated in close proximity to the prison during the latter twentieth century and especially over the past fifty years as incarceration rates skyrocketed. After examining several important theological tenets reflected within Evangelicalism that are compatible with eugenic logic, a critical approach is developed drawing from more robust theological considerations that if appropriated earlier might have found evangelicals resisting the mass incarceration building efforts rather than supporting them.