 We will then turn to his Critical period, where we will discuss how Transcendental Idealism shaped his philosophy of religion, his Critical treatment of the arguments for God’s existence, his conception of God, epistemology of religion, distinction between Deism and Theism, the relationship between the highest good and the practical postulates, interpretations of his approach to Christian doctrine, an overview of the four parts of Religion within the Boundaries of Mere Reason, and, finally, his Opus Postumum. Throughout, attention will be paid to many of the points of interpretative dispute over key aspects of his philosophy of religion.