Eastern Ukraine
According to a 2016 survey of religion in Ukraine held by the Razumkov Center, 73.5% of the population in Eastern Ukraine were Christians (63.2% Eastern Orthodox, 8.1% simply Christians, 1.0% Protestants, and 0.3% Latin Rite Catholics), 0.5% were Muslims, 0.3% were Jewish, and 0.3% were Hindus. Not religious and other believers not identifying with any of the listed major religious institutions constituted about 24.7% of the population. It also showed that approximately 55.6% of the population of eastern Ukraine (which in Razumkov's mapping excluded Donbass and consisted of the regions immediately to the west of it) declared to be believers, while 13.4% declared to be undecided or non-believers, and 3.5% declared to be atheist. 
A 2007 survey by the Razumkov Centre asked "Would you like to have your region separated from Ukraine and joined another state?" In eastern Ukraine, 77.9% of respondents disagreed, 10.4% agreed, and the rest were undecided. 
In a poll conducted by the Kyiv International Institute of Sociology in the first half of February 2014, 25.8% of those polled in East Ukraine believed "Ukraine and Russia must unite into a single state", nationwide this percentage was 12.5%.
Islam in Ukraine
Estimates of the Ukrainian Muslim population vary. Muslims make up only approximately 0.9% of the Ukrainian population, but as much as 12% in Crimea. According to the 2000 census Ukraine was home to 248,193 Crimean Tatars, 73,304 Volga Tatars, 45,176 Azeris, 12,353 Uzbeks, 8,844 Turks, 6,575 Arabs and 5,526 Kazakhs. The 2012 Freedom Report estimating a Muslim population of 500,000 in Ukraine, including 300,000 Crimean Tatars. A 2011 Pew Forum study estimated a Ukrainian Muslim population of 393,000, but the Clerical Board of Ukraine's Muslims claimed there were two million Muslims in Ukraine as of 2009. According to Said Ismagilov, the mufti of Ummah, in February 2016 one million Muslims lived in Ukraine.