Professor Tillich gives one protestant view of the present situation in religion and quasi-religion，Christian principles of judging Non-Christian religions, a Christian-Buddhist conversation and Christianity judging itself. Tillich here defines religion as "the state of being grasped by an ultimate concern." Religion usually defines the ultimate concern as gods, god，or a highest principle. He defines a quasi-religion as one，which has genuine similarity with religion; it should not be confused with pseudo-religion.
