Time magazine called 1976 "the year of the evangelical" partly in response to the rapid political ascent of the previously little-known Georgia governor Jimmy Carter. A Sunday school teacher and deacon in his local church, Carter emphasized the important role of faith in his life in a way that no presidential candidate had done in recent memory. However, scholarly assessments of Carter's foreign policy have primarily focused on his management style or the bureaucratic politics in his administration. This study adds to the growing literature in American diplomatic history analyzing religion and foreign policy by focusing on how Carter's Christian beliefs and worldview shaped his policymaking and how his religious convictions affected his advisors. To better demonstrate this connection, this dissertation primarily discusses Carter's foreign policy vis-à-vis religious nationalist groups of the three Abrahamic faiths (Judaism, Christianity, Islam). By drawing on archival materials from the Jimmy Carter Presidential Library, Carter's own voluminous writings, and memoirs of other administration officials, this dissertation argues that Carter's religious values factored into policymaking decisions, although sometimes in a subtle fashion due to his strong Baptist doctrinal commitment to the separation of church and state. Moreover, Carter's initial success in using his religious beliefs in the Camp David negotiations raised expectations among administration officials and others when crises arose, such as the hostage taking in Iran and the electoral threat of the Christian Right. Despite his success at Camp David, invoking religious values can complicate situations already fraught with sacred symbolism. Ultimately, this dissertation points to the benefits and limits of foreign policy shaped by a president with strong public religious convictions as well as the advantages and pitfalls of scholars examining the impact of religion on presidential decision making.