In this chapter, the author introduces a theology of culture in which the cultural expressions of our postmodern society can theologically be interpreted as testimonies of the self-revelational God of Christian tradition. The author pleads for an idea of God as the Deus incognitus, in a world that seems to have abandoned the idea of a transcendent and divine being. As a basis for his cultural theology, the author probes the history of Western Christianity for similar insights such as the logoi spermatikoi of Justin Martyr, the idea of the praeparatio Evangelica of Eusebius and the ‘implicit theologies’ of Bultmann and Tillich. The author also explains the precarious situation of (institutionalized) religion in postmodern Western society. But contrary to popular belief, the author also argues that people are still as religious and spiritual as ever, but fail to recognize this because of secularization, de-institutionalization and religious de-verbalization.