Introduction: The struggle for the soul of the Twenty-first Century -- PART ONE: BRINGING RELIGION BACK INTO INTERLATIONAL RELATIONS THEORY: "The revenge of God?" : The Twentieth Century as the "Last Modern Century" -- Blind spots and blowback: why culture and religion were marginalized in international relations theory -- In the eye of the story: explaining and understanding culture and religion in international relations -- The soul of the world? Religious non-state actors and international relations theory -- PART TWO: THE SUBSTANTIVE ISSUES IN INTERNATIONAL RELATIONS: Wars and rumors of war? Religion and international conflict -- "Creating a just and durable peace" : Rethinking religion and international cooperation -- Soulcraft as statecraft? Diplomacy, conflict, revolution, and peacebuilding -- Funding virtue? Rethinking religion, civil society, and democracy --When faith and economics meet? Rethinking religion, civil society and international development -- Conclusion: How shall we then live?