Pursuing Jacques Derrida's reflections on the possibility of "religion without religion," John Llewelyn makes room for a sense of the religious that does not depend on religions or traditional notions of God or gods. Beginning with Derrida's statement that it was Kierkegaard to whom he remained most faithful, Llewelyn reads Kant, Hegel, Nietzsche, Feuerbach, Heidegger, Sartre, Levinas, Deleuze, and Marion, as well as Kierkegaard and Derrida, in original and compelling ways. Llewelyn puts religiousness in vital touch with the struggles of the human condition, finding religious space in the margins between the secular and the religious, transcendence and immanence, faith and knowledge, affirmation and despair, lucidity and madness. This provocative and philosophically rich account shows why and where religion matters.