Since 2001, there has been a noticeable increase in the number of scholarly monographs dedicated to religion and foreign relations. More scholars and policymakers agree that religion is an important feature of foreign affairs, regardless of whether one thinks it ought to be. While policymakers and scholars often discuss “religion” as a single “lens” for understanding the world, religious traditions do not exist in isolation from the political, economic, or social and cultural aspects of life. Tracing religious influences on U.S. foreign policy, then, can lead scholars in a variety of directions. Scholars researching religious influences in foreign policy could consider theologies and creeds of religious organizations and figures, the rhetoric and rituals of national norms and civic values, the intersection of “sacred” and “secular” ideas and institutions, the service of individual policymakers and diplomats, international legal or military defenses for or against specific religious groups, or public discourse about religion, to name but a few options. Advances in the study of religion and foreign policy will require collaboration and dialogue across traditional boundaries for disciplines, fields, and subfields. For many scholars, this means broadening research approaches and methods. Instead of prioritizing “first-” and “second-” order causes, for instance, historians and social scientists could move beyond cause-effect relationships alone, complicating U.S. foreign relations by considering intersectional experiences and interstitial explanations. Rather than looking for “the” univocal religious influence, scholars might pay greater attention to the multiplicity of “religious” influences on a given topic. This will likely occur by reading and researching beyond one specific area of expertise. It will also require attention to differentiating between institutional and “popular” or “lived” religion; recognizing the disparities between the official dogma of a religious affiliation and ethnographic and empirical data on religious practice; and giving attention to the underlying assumptions that occur when international organizations, national governments, and scholars choose to pay attention to certain forms of “religious” thought, behavior, and organizations and not others.