https://en.wikipedia.org/wiki/Eastern_Orthodoxy_in_Europe
History. Almost all of Eastern Orthodox Europe became part of communist states after World War II.. Eastern Orthodoxy in Orthodox majority countries. Eastern Orthodoxy in Moldova, 97.0% (2017 census); Eastern Orthodoxy in Greece, 90%; Eastern Orthodoxy in Serbia, 84.6% (2011 census); Eastern Orthodoxy in Romania, 81.0% (2015 census); Eastern Orthodoxy in Georgia, 83.4% …