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.
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.