This paper is focused on changing rates of church affiliation and church attendance in the course of intergenerational and intragenerational transmission on the cases of four post-communist countries of central Europe: the Czech Republic, Slovakia, Hungary and Poland. It is a generally accepted fact that the rates of traditional forms of religiosity in the Czech society declined continuously during the second half of the 20th century, while such an enormous decline was not indicated in other post-communist countries of Central Europe. These differences and their causes are main question for this analytical work. Contemporary religiosity is dependent on rates of its reproduction between generations. Inter- and intragenerational transmission was influenced by two basic factors: First, by an anti-religious policy, which varied between the communist regimes, and second by the resistance of some people and families against that concrete anti-religious policy. The rapid secularisation of Czech society was due to those two factors.