Southern Ukraine
According to a 2016 survey of religion in Ukraine conducted by the Razumkov Center, around 65.7% of the population of southern Ukraine declared to be believers in any religion, while 7.4% declared to be non-believers, and 3.2% declared to be atheists and agnostics. the study also found that 77.6% of the total Southern Ukraine population declared to be Christians (71.0% Eastern Orthodox, 5.1% simply Christians, 0.5% Latin Rite Catholics, 0.53% members of various Protestant churches, 0.5% members of the Ukrainian Greek Catholic Church), and 0.5% were Jewish. Not religious and other believers not identifying with any of the listed major religious institutions constituted about 24.7% of the population.
History of Christianity in Ukraine
In the Union of Brest of 1596 (colloquially known as "unia"), a part of the Ukrainian Church was accepted under the jurisdiction of the Roman Pope, becoming a Byzantine Rite Catholic Church, a Ukrainian Greek Catholic Church, colloquially known as the Uniate Church. While the new church gained many faithful among the Ukrainians in Galicia, the majority of Ukrainians in the rest of the lands remained within Eastern Orthodoxy with the church affairs ruled by then from Kiev under the metropolitan Peter Mogila "(Petro Mogyla)". The Orthodox Church was made illegal (its legality was partially restored in 1607), its property confiscated, and Orthodox believers faced persecution and discrimination which became an important reason for large numbers of Ukrainians to emigrate to Tsardom of Russia following the Union. The eastward spread of the Union of Brest led to violent clashes, for example, assassination of the Greek Catholic Archbishop Josaphat Kuntsevych by the Orthodox mob in Vitebsk in 1623.