Orthodox Church of the Czech Lands and Slovakia in the context of "Church Slavonic"

Religion in Slovakia is predominantly Christianity, adhered to by about 68.8% of the population in 2021.

The Catholic Church is the major Christian tradition in the country, followed in 2021 by 59.8% of the population, a majority of whom (55.8%) were of the Latin Church and a minority of whom (4%) were of the Slovak Greek Catholic Church. About 9% of the population were mostly followers of Protestantism, and a minority of Eastern Orthodox Church and other Christian denominations; the major groupings are the Evangelical Church of the Augsburg Confession in Slovakia (5.3%), the Reformed Christian Church in Slovakia (1.6%), the Orthodox Church of the Czech Lands and Slovakia (0.9%), the Jehovah's Witnesses (0.3%), and other smaller Christian denominations (0.9%). In 2021, about 23.8% of the population declared themselves not religious, an increase from 13.4% in 2011. An additional 1.2% of the population were followers of other religions or beliefs; small religious minorities in Slovakia include Buddhism, modern Paganism, Islam, Judaism, Jediism, Hinduism

Church Slavonic is the conservative Slavic liturgical language used by the Eastern Orthodox Church in Belarus, Bulgaria, North Macedonia, Montenegro, Poland, Russia, Ukraine, Serbia, the Czech Republic and Slovakia, Slovenia and Croatia. The language appears also in the services of the Russian Orthodox Church Outside of Russia, the American Carpatho-Russian Orthodox Diocese, and occasionally in the services of the Orthodox Church in America.

In addition, Church Slavonic is used by some churches which consider themselves Orthodox but are not in communion with the Orthodox Church, such as the Montenegrin Orthodox Church and the Russian True Orthodox Church. The Russian Old Believers and the Co-Believers also use Church Slavonic.