God’s Cold Warrior recounts how Dulles’s faith commitments from his Presbyterian upbringing found fertile soil in the anti-communist crusades of the mid-twentieth century. After attending the Oxford Ecumenical Church Conference in 1937, he wrote about his realization that “the spirit of Christianity, of which I learned as a boy, was really that of which the world now stood in very great need, not merely to save souls, but to solve the practical problems of international affairs.” Dulles believed that America was chosen by God to defend the freedom of all those vulnerable to the godless tyranny of communism, and he carried out this religious vision in every aspect of his diplomatic and political work. He was conspicuous among those US officials in the twentieth century that prominently combined their religious convictions and public service, making his life and faith key to understanding the interconnectedness of God and country in US foreign affairs.