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.
State atheism
Today in the Russian Federation, approximately 100 million citizens consider themselves Russian Orthodox Christians, amounting to 70% of the population, although the Church claims a membership of 80 million. According to the CIA Factbook, however, only 17% to 22% of the population is now Christian. According to a poll by the Russian Public Opinion Research Center, 63% of respondents considered themselves Russian Orthodox, 6% of respondents considered themselves Muslim and less than 1% considered themselves either Buddhist, Catholic, Protestant or Jewish. Another 12% said they believe in God, but did not practice any religion, and 16% said they are non-believers. In Ukraine, 96.1% of the Ukrainian population is Christian. In Lithuania, the only Catholic country which was once a Soviet republic, a 2005 report stated that 79% of Lithuanians belonged to the Roman Catholic Church.