Religions
Major religion Groups
Russia,
Russian Orthodox 15-20%, Muslim 10-15%, other Christian 2%
Czech Republic,
Roman Catholic 10.4%, Protestant 1.1%, other and unspecified 54%, none 34.5%
Poland,
Catholic 87.2% (includes Roman Catholic 86.9% and Greek Catholic, Armenian Catholic, and Byzantine-Slavic Catholic .3%), Orthodox 1.3% other 0.4% unspecified 10.8%
Hungary
Roman Catholic 37.2%, Calvinist 11.6%, Lutheran 2.2%, Greek Catholic 1.8%, other 1.9%, none 18.2%, unspecified 27.2%
Romania
Eastern Orthodox 81.9%, Protestant 6.4%, Roman Catholic 4.3%, other 0.9%, none or atheist 0.2%, unspecified 6.3%
Moldova
Orthodox 93.3%, Baptist 1%, other Christian 1.2%, other 0.9%, atheist 0.4%, none 1%, unspecified 2.2%
Croatia
Roman Catholic 86.3%, Orthodox 4.4%, Muslim 1.5%, other 1.5%, unspecified 2.5%, not religious or atheist 3.8%
Lithuania
Roman Catholic 77.2%, Russian Orthodox 4.1%, Old Believer 0.8%, Evangelical Lutheran 0.6%, Evangelical Reformist 0.2%, other (including Sunni Muslim, Jewish, Greek Catholic, and Karaite) 0.8%, none 6.1%, unspecified 10.1%
Latvia
Lutheran 19.6%, Orthodox 15.3%, other Christian 1%, other 0.4%, unspecified 63.7%
Estonia
Lutheran 9.9%, Orthodox 16.2%, other Christian (including Methodist, Seventh-Day Adventist, Roman Catholic, Pentecostal) 2.2%, other 0.9%, none 54.1%, unspecified 16.7%
Slovenia
Catholic 57.8%, Muslim 2.4%, Orthodox 2.3%, other Christian 0.9%, unaffiliated 3.5%, other or unspecified 23%, none 10.1%
Slovakia
Roman Catholic 62%, Protestant 8.2%, Greek Catholic 3.8%, other or unspecified 12.5%, none 13.4%
Bulgaria
Eastern Orthodox 59.4%, Muslim 7.8%, other (including Catholic, Protestant, Armenian Apostolic Orthodox, and Jewish) 1.7%, none 3.7%, unspecified 27.4%
Ukraine
Orthodox (includes Ukrainian Autocephalous Orthodox (UAOC), Ukrainian Orthodox - Kyiv Patriarchate (UOC-KP), Ukrainian Orthodox - Moscow Patriarchate (UOC-MP), Ukrainian Greek Catholic, Roman Catholic, Protestant, Muslim, Jewish
Ukraine's population is overwhelmingly Christian; the vast majority - up to two-thirds - identify themselves as Orthodox, but many do not specify a particular branch; the UOC-KP and the UOC-MP each represent less than a quarter of the country's population, the Ukrainian Greek Catholic Church accounts for 8-10%, and the UAOC accounts for 1-2%; Muslim and Jewish adherents each compose less than 1% of the total population
Belarus
Orthodox 48.3%, Catholic 7.1%, other 3.5%, non-believers 41.1%
Serbia
Serbian Orthodox 84.6%, Catholic 5%, Muslim 3.1%, Protestant 1%, atheist 1.1%, other 0.8%, undeclared or unknown 4.5%
Montenegro
Orthodox 72.1%, Muslim 19.1%, Catholic 3.4%, atheist 1.2%, other 1.5%, unspecified 2.6%
Bosnia & Herzegovina
Muslim 50.7%, Orthodox 30.7%, Roman Catholic 15.2%, atheist 0.8%, agnostic 0.3%, other 1.2%, undeclared/no answer 1.1%
Albania
Muslim 56.7%, Roman Catholic 10%, Orthodox 6.8%, atheist 2.5%, Bektashi (a Sufi order) 2.1%, other 5.7%, unspecified 16.2%
Kosovo
Muslim 95.6%, Roman Catholic 2.2%, Orthodox 1.5%, other 0.07%, none 0.07%, unspecified 0.6%
Macedonia
Macedonian Orthodox 64.8%, Muslim 33.3%, other Christian 0.4%, other and unspecified 1.5%
Russian Orthodox 15-20%, Muslim 10-15%, other Christian 2%
Czech Republic,
Roman Catholic 10.4%, Protestant 1.1%, other and unspecified 54%, none 34.5%
Poland,
Catholic 87.2% (includes Roman Catholic 86.9% and Greek Catholic, Armenian Catholic, and Byzantine-Slavic Catholic .3%), Orthodox 1.3% other 0.4% unspecified 10.8%
Hungary
Roman Catholic 37.2%, Calvinist 11.6%, Lutheran 2.2%, Greek Catholic 1.8%, other 1.9%, none 18.2%, unspecified 27.2%
Romania
Eastern Orthodox 81.9%, Protestant 6.4%, Roman Catholic 4.3%, other 0.9%, none or atheist 0.2%, unspecified 6.3%
Moldova
Orthodox 93.3%, Baptist 1%, other Christian 1.2%, other 0.9%, atheist 0.4%, none 1%, unspecified 2.2%
Croatia
Roman Catholic 86.3%, Orthodox 4.4%, Muslim 1.5%, other 1.5%, unspecified 2.5%, not religious or atheist 3.8%
Lithuania
Roman Catholic 77.2%, Russian Orthodox 4.1%, Old Believer 0.8%, Evangelical Lutheran 0.6%, Evangelical Reformist 0.2%, other (including Sunni Muslim, Jewish, Greek Catholic, and Karaite) 0.8%, none 6.1%, unspecified 10.1%
Latvia
Lutheran 19.6%, Orthodox 15.3%, other Christian 1%, other 0.4%, unspecified 63.7%
Estonia
Lutheran 9.9%, Orthodox 16.2%, other Christian (including Methodist, Seventh-Day Adventist, Roman Catholic, Pentecostal) 2.2%, other 0.9%, none 54.1%, unspecified 16.7%
Slovenia
Catholic 57.8%, Muslim 2.4%, Orthodox 2.3%, other Christian 0.9%, unaffiliated 3.5%, other or unspecified 23%, none 10.1%
Slovakia
Roman Catholic 62%, Protestant 8.2%, Greek Catholic 3.8%, other or unspecified 12.5%, none 13.4%
Bulgaria
Eastern Orthodox 59.4%, Muslim 7.8%, other (including Catholic, Protestant, Armenian Apostolic Orthodox, and Jewish) 1.7%, none 3.7%, unspecified 27.4%
Ukraine
Orthodox (includes Ukrainian Autocephalous Orthodox (UAOC), Ukrainian Orthodox - Kyiv Patriarchate (UOC-KP), Ukrainian Orthodox - Moscow Patriarchate (UOC-MP), Ukrainian Greek Catholic, Roman Catholic, Protestant, Muslim, Jewish
Ukraine's population is overwhelmingly Christian; the vast majority - up to two-thirds - identify themselves as Orthodox, but many do not specify a particular branch; the UOC-KP and the UOC-MP each represent less than a quarter of the country's population, the Ukrainian Greek Catholic Church accounts for 8-10%, and the UAOC accounts for 1-2%; Muslim and Jewish adherents each compose less than 1% of the total population
Belarus
Orthodox 48.3%, Catholic 7.1%, other 3.5%, non-believers 41.1%
Serbia
Serbian Orthodox 84.6%, Catholic 5%, Muslim 3.1%, Protestant 1%, atheist 1.1%, other 0.8%, undeclared or unknown 4.5%
Montenegro
Orthodox 72.1%, Muslim 19.1%, Catholic 3.4%, atheist 1.2%, other 1.5%, unspecified 2.6%
Bosnia & Herzegovina
Muslim 50.7%, Orthodox 30.7%, Roman Catholic 15.2%, atheist 0.8%, agnostic 0.3%, other 1.2%, undeclared/no answer 1.1%
Albania
Muslim 56.7%, Roman Catholic 10%, Orthodox 6.8%, atheist 2.5%, Bektashi (a Sufi order) 2.1%, other 5.7%, unspecified 16.2%
Kosovo
Muslim 95.6%, Roman Catholic 2.2%, Orthodox 1.5%, other 0.07%, none 0.07%, unspecified 0.6%
Macedonia
Macedonian Orthodox 64.8%, Muslim 33.3%, other Christian 0.4%, other and unspecified 1.5%
in general, Christianity is the biggest religion in eastern europe. Islam is the second biggest religion. To the south of eastern europe, There is a large number of Catholics. In the East, there is mostly orthodox. One part of russia has a big influence of islam and one area has a lot of buddhism. Right now, there are no major religious conflicts is eastern europe.
to see religon spread over time, go to http://www.businessinsider.com/map-shows-how-religion-spread-around-the-world-2015-6
Kuzoian, Alex. "This Animated Map Shows How Religion Spread across the World." Business Insider. Business Insider, 06 July 2015. Web. 04 Dec. 2016.
Kuzoian, Alex. "This Animated Map Shows How Religion Spread across the World." Business Insider. Business Insider, 06 July 2015. Web. 04 Dec. 2016.