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
As of 2018, Christianity was particularly strong in westernmost Ukrainian regions, where most Greek Catholics lived. In central, southern and eastern regions, Christians constitute a smaller proportion of the total population, particularly low in the easternmost region of Donbass. Another religion that is present in Ukraine besides Christianity is Rodnovery (Slavic native faith), which comprises Ukrainian- and Russian-language communities (some Rodnover organizations call the religion , "Orthodoxy", thus functioning in homonymy with Christian Orthodox churches). Hinduism has been spread after the collapse of the Soviet Union by Indian and International Society for Krishna Consciousness' missionaries and is particularly present in the Donbass region. Crimean Tatars professing Islam represent a significant part of the population in Crimea, which prior 2014 was a subject of Ukraine, but has been since that year occupied by Russia. As of 2016, without Crimea, where Muslims formed 15% of the population in 2013, only Donbass maintains a larger community of Muslims compared to other Ukrainian regions (6%).