Since the end of the Cold War, religion has been systematically brought to the fore of American foreign policy. US foreign policymakers have been increasingly tasked with promoting religious freedom globally, delivering humanitarian and development aid abroad through faith-based channels, pacifying Muslim politics and reforming Islamic theologies in the context of fighting terrorism, and engaging religious actors to solve multiple conflicts and crises around the world. Across a range of different domains, religion has progressively become an explicit and organized subject and object of US foreign policy in ways that were unimaginable just a few decades ago. If God was supposed to be vanquished by the forces of modernity and secularization, why has the United States increasingly sought to understand and manage religion abroad? In what ways have the boundaries between faith and state been redefined as religion has become operationalized in American foreign policy? What kind of world order is emerging in the twenty-first century as the most powerful state in the international system has come to intervene in sustained and systematic ways in sacred landscapes around the globe? This book addresses these questions by developing an original theoretical framework and drawing upon extensive empirical research and interviews. It argues that American foreign policy and religious forces have become ever more inextricably entangled in an age witnessing a global resurgence of religion and the emergence of a postsecular world society.