The depiction of the relation of God and man is one of the most difficult challenges of religious philosophy and even more the understanding of God and the human self-conception are deeply entwined. Trying an access to both questions starting from subjectivity, the idea of God is investigated in Descartes, Feuerbach and Husserl. After a discussion of the idea of God in Descartes and its consequences for human aspiration, the opposite standpoint of Feuerbach and his so-called theory of projection will be examined. Finally, aspects from both thinkers are brought together in Husserl’s phenomenological ethics. The idea of God is the entelechy of reason and self-realizing goodness, in which the searching person can realize its own potentials as much as its own abyss, yet is always called to advance beyond herself and toward the ever-beyond God within.