Eastern Orthodoxy by country
Based on the numbers of adherents, the Eastern Orthodox Church (also known as Eastern Orthodoxy) is the second largest Christian communion in the world after the Roman Catholic Church. The most common estimates of the number of Eastern Orthodox Christians worldwide is approximately 200–260 million. The numerous Protestant groups in the world, if taken all together, outnumber the Eastern Orthodox, but they differ theologically and do not form a single communion.
North Slavs
In the present day, Christianity dominates among the North Slavic peoples, with Eastern Orthodoxy and Roman Catholicism being the most popular denominations. In 2011, 48.3% of Belarusians living in their home country declared themselves as Orthodox. A 2012 study in Russia placed the number of Orthodox Russians at 41%, whereas a 2016 survey tells us that 65.4% of Ukrainians share these beliefs. 87.5% of Poland's population declared Roman Catholic faith. 65% of Polish believers attend church services on a regular basis. 62% of Slovakia's inhabitants are Catholic. Among Czechs, 34.5% claim to have no religion, 44.7% undeclared, and only 10.5% Roman Catholics.