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%.
Religion in Ukraine
The Slavic native faith (Rodnovery, Ukrainian: Рідновірство "Ridnovirstvo", Рідновір'я "Ridnovirya" or Рiдна Вiра "Ridna Vira"; otherwise called Православ'я "Pravoslavya"—"Orthodoxy") is represented in Ukraine by numerous organizations. As of 2016 there are 138 registered communities divided between the Church of the Native Ukrainian National Faith (Рідна Українська Національна Віра, RUNVira)—72 churches, the Ancestral Fire of Native Orthodoxy (Родового Вогнища Рідної Православної Віри)—21 churches, the Church of the Ukrainian Gentiles (Церкви Українських Язичників)—7 churches, the Federation of Ukrainian Rodnovers (Об'єднання Рідновірів України)—6 churches, and other organizations—32 churches. The Federation of Ukrainian Rodnovers was founded in 1998 by Halyna Lozko and has chapters in Kiev, Kharkiv, Odessa, Boryspil, Chernihiv, Mykolaiv, Lviv and Yuzhnoukrainsk. There are many other unregistered groups and federations, for instance the Ancestral Fire of the Slavic Native Faith (Родове Вогнище Слов'янської Рідної Віри), the Wrath of God Native Orthodox Faith, the North Caucasian Scythian Regional Fire, the Order of the Knights of the Solar God and the Rodoliubye Russian Rodnover Community.