In the Czech Republic, 47.8% of population is irreligious, while 21.3% of the population are believers. The religious identity of the country has changed drastically since the first half of the 20th century, when more than 90% of Czechs were Christians. As of 2021, 11.7% of the population identified with Christianity whilst 10.8% identified with other religious identities or beliefs. According to sociologist Jan Spousta, not all the irreligious people are atheists; indeed, since the late 20th century there has been an increasing distancing from both Christian dogmatism and atheism, and at the same time ideas and non-institutional models similar to those of Eastern religions have become widespread through movements started by various gurus, and hermetic and mystical paths.

The Czechoslovak Socialist Republic, known from 1948 to 1960 as the Czechoslovak Republic, Fourth Czechoslovak Republic, or simply Czechoslovakia, was the Czechoslovak state from 1948 until 1989, when the country was under communist rule, and was regarded as a satellite state in the Soviet sphere of interest.