Slavs
Slavs can be further grouped by religion. Orthodox Christianity is practiced by the majority of Slavs. The Orthodox Slavs include the Belarusians, Bulgarians, Macedonians, Montenegrins, Russians, Serbs, and Ukrainians and are defined by Orthodox customs and Cyrillic script as well as their cultural connection to the Byzantine Empire (Serbs also use Latin script on equal terms). Their second most common religion is Roman Catholicism. The Catholic Slavs include Croats, Czechs, Kashubs, Moravians, Poles, Silesians, Slovaks, Slovenes, and Sorbs and are defined by their Latinate influence and heritage and connection to Western Europe. There are also substantial Protestant and Lutheran minorities especially amongst the West Slavs, such as the historical Bohemian (Czech) Hussites.
Ukraine
The second largest Christian group in Ukraine, Catholicism, is predominantly represented by the Ukrainian Greek Catholic Church, an Eastern Catholic Church in communion with the Holy See of the Roman Catholic Church. It recognizes the primacy of the Pope as head of the Church while still maintaining a similar liturgical and spiritual tradition as Eastern Orthodoxy. Additionally, there are a small number of Latin Rite Catholic communities (1.0%). The church consists mainly of ethnic Poles and Hungarians, who live predominantly in the western regions of the country. Protestants in Ukraine make up 1.9% of the population as of 2016. A further 7.1% of the population declares to be simply Christian.