The recent debate on the notorious Anselmian proof of God’s existence, usually called the “ontological argument”, is placed within an analytic approach, since Alvin Plantinga revisited this argument beginning in the sixties and especially during the seventies. At the same time, Michel Henry contested this proof, situating the debate in a completely different area of philosophy. Henry’s critique does not concern the question of logical validity or the matter of rational justification of religious belief. Rather, Henry focuses on the way existence is conceived. In so doing, his phenomenology of life shows the difference between affirming God’s existence (in every “possible world”) and accessing God’s presence inside the ego’s subjectivity. In this article, I will try to show how Henry’s way of proceeding makes self-life-experience a legitimate foundation for a belief in God’s presence (not only the simple intellectual affirmation of His existence).