What is Religious Experience? For more than a hundred years the term "religious experience" has been part of the vocabulary of philosophy of religion. However, there is no common understanding of the meaning of religious experience.Mario Fischer analyzes Heidegger's early phenomenology of religious life and its background in contemporaneous theological and philosophical developments. The young Martin Heidegger developed his first autonomous phenomenological approaches by considering how the Christian experience of life is expressed in the letters of the apostle Paul and in Augustine's Confessions. These studies led to his later analysis of Dasein in Being and Time.In conclusion, Fischer examines the significance of Heidegger's understanding of religious experience for current discussions in the philosophy of religion.