Can theology still operate in the void of post-theism? In attempting to answer this question Agnosis examines the concept of the void itself, tracing a history of nothingness from Augustine through Kierkegaard and Nietzsche to Bataille and Derrida, and dialoguing with Japan's Kyoto School philosophers. It is argued that neither Augustinian nor post-Hegelian metaphysics have given a satisfactory understanding of nothingness and that we must look to an experience of nothingness as the best ground for future religious life and thought.