Weakening of Metaphysical God in the Rationality of Modern Subject from Heidegger’s Point of View

،hrough historical investigations of western thought history, later Heidegger describes modern philosophy as the continuity, not separation, of Greek metaphysical tradition. He interprets Cartesian subjectivism as the consequence of Greek onto-theology, especially Plato and Aristotle's thoughts. The development of the intellectual subject's self-consciousness, as the logical and necessary expansion of Greek rationality (the metaphysics), led Descartes to interpret Being as representedness for the knowing subject. Consequently, representedness has been indebted to the human subject as the ground of beings. That means he can take possession of God's position that previously in metaphysics and philosophical theology had belonged to Him. But the human's new position leads to a deterioration in his credibility as the foundation of beings and brings doubts concomitant with his existence and meaningfulness.