Existentialist philosophy of Martin Heidegger (1889-1976). Its most significant influence on Christianity is through demythologists like Rudolf Bultmann, who accepted Heidegger's theory of knowledge. A human is said to be a being in time. He is Dasein in Zeitlichkeit, or "being in temporality," i.e., one who is constantly changing with the passage of time. What the Gospels narrate took place or was said in time, which is past history. The Christian story, therefore, is "sacred history," which means factual data that have been sacralized, overladen with nonfactual and mythological lore that belongs to a former, credulous age.