The study of spatial and social aspects of religion in Central-and Eastern-European countries struggles with the lack of representative data from the socialist era. Crude yet very unique data coming from the 1950 census, the first under socialism, which still contained questions about religious adherence are analysed here. Within the framework of serious opinions analysing the situation in Slovakia in its broader geopolitical situation comparing the religiosity level between 1950 and 2001, regions of Slovakia with variable depth of changes of overall religious identity are identified. The intensity of secularization in districts of Slovakia is scaled on 4 levels. It seems that the uneven distribution of urbanization, industrialization, specific religious structure of the population (Protestant especially) in certain regions and other processes here connected with socialism enabled the creation of a variable religious landscape in Slovakia with different levels of retreat of religion. Surprisingly, not just the biggest cities, but also many rural areas became intensively secularized.