Central Ukraine
According to a 2016 survey of religion in Ukraine held by the Razumkov Center, approximately 73.5% of the population of central Ukraine declared to be believers, while 4.8% declared to be non-believers, and 2.6% declared to be atheist. Of the total population, 86.5% were Christians (76.7% Eastern Orthodox, 6.5% simply Christians, 1.9% Latin Rite Catholics, 1.0% members of various Protestant churches, and 0.4% members of the Ukrainian Greek Catholic Church), 0.3% were Jewish, and 0.1% were Muslims. Not religious and other believers not identifying with any of the listed major religious institutions constituted about 12.8% of the population.
History of Christianity in Ukraine
As the "unia" continued its expansion into Ukraine, its unpopularity grew, particularly in the southern steppes where Dnieper Cossacks lived. The Cossacks valued their traditions and culture saw the "unia" as a final step of Polonization. As a result, they reacted by becoming fierce proponents of Orthodoxy. Such feelings played a role in the mass uprising whose targets included all non-Orthodox religious proponents, the Catholic and Uniate clergy and Jews. During this time metropolitan Mogila took full advantage of the moment to restore the Orthodox domination in Ukraine, including returning one of its sacred buildings, the Saint Sophia Cathedral in Kiev.