By Pew Research Center.
Over the past two decades, since the collapse of the Soviet Union, there has been an upsurge in affiliation with Orthodox Christianity in Russia. Between 1991 and 2008, the share of Russian adults identifying as Orthodox Christian rose from 31% to 72%, according to a new Pew Research Center analysis of three waves of data (1991, 1998 and 2008) from the International Social Survey Programme (ISSP) – a collaboration involving social scientists in about 50 countries. During the same period, the share of Russia’s population that does not identify with any religion dropped from 61% to 18%. The share of Russian adults identifying with other religions, including Islam, Protestant Christianity and Roman Catholicism, rose in the 1990s and then leveled off. (Estimates of the size of Russia’s Muslim population vary. The most recent ISSP survey finds that Muslims make up 5% of Russia’s population, but other surveys and studies have somewhat higher estimates… http://bit.ly/1eK4W5x