The majority religion in the Ukraine is Eastern Orthodoxy. Eastern Orthodoxy is an old, very traditional form of Christianity which is mainly practiced in Russia, Greece, and Cyprus.
the wiki about Ukraine contains the answer.
Christianity.
Eastern Orthodoxy
Ethnic Russians are most closely related to other East Slavic peoples, such as Ukrainians and Belarusians. They also share genetic and cultural ties with other Slavic groups, such as Poles and Czechs.
The main Slavic descendent groups are the Russians, Poles and Ukrainians. Also most of the Balkan population is Slavic
The most widely followed religion is Islam
most were farmers.
Unlike Hitler, Stalin committed genocide against a wide variety of people. They included Russian Muslims, Germans, Don Cossacks, Lithuanians, Latvians, Estonians, Poles, Ukrainians, and political dissidents.
The most important minorities are Hungarians, Gypsies, Ukrainians, Germans. Also exist Turks, Russians, Tartarians, Serbians etc.
Russian Orthodoxy
catholism followed by islam followed by judaism
Some do and some do not. Many Russians are Christians, most commonly Orthodox, but many Russians are atheists and were encouraged to be so during the time of the Soviet Union.
christianity, sadly.
Catholic/Christian
Roman Catholisism