Abstract
This work presents the issue of the possibility of concluding a Concordat of the Czech Republic and the Holy See from the point of view of religion and census, ie its demographic, historical, political and legal context. At the 1991 census of people, flats and houses, the question of religion was again included after forty years.
The census recorded a decrease in believers, especially in large churches, on the one hand, and an increase in nonbelievers on the other. This trend continued in subsequent censuses already in the divided republics of 2001 and 2011.
This work shows the development of international relations between the Czech Republic and the Holy See in terms of efforts to conclude an international treaty (and previous treaties) - the socalled Concordat, which faithfully replicate the entire development of relations between the two subjects of international law. It shows the issue of the Austrian Concordat of 1855, the Concordat Modus vivendi treaty of 1928, the draft of the new Concordat of 2002 and the secret negotiations on the new Concordat of 2014.
Further efforts to self-determine clerics and believers in the Czech Republic by concluding a new international treaty can be expected. However, the possible conclusion of the new wording will be based on the current political situation and the majority consensus, quite possibly, for example, as a definition against Islamization in the sense of non-indigenous cultures and threats of terro-rism.
Given the current state of secularization in the Czech Republic and the religious beliefs of citizens, it is necessary to approach critics and reject the possibility of concluding a new Concordat.