The paper attempts at achieving the conceptual understanding of the desecularization, the idea first proposed by Peter L. Berger in late 1990s. The idea still lacks theoretical elaboration as the sociology of religion is usually late in such theoretical enterprise; this paper tries to fill the gap. In doing so, the author starts with using categorical language of the secularization theory, which was developed in the course of the twentieth century. Yet he adds other theoretical frames and takes a new approach concentrating upon actors, patterns, regimes, and levels of desecularization.