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.
Early Slavs
According to historical records, the Slavic homeland would have been somewhere in central Europe, possibly along the southern shore of the Baltic Sea. The -Penkova- complex of cultures during the sixth and seventh centuries AD is generally accepted to reflect the expansion of Slavic speakers at the time. Core candidates are cultures within the territories of modern Belarus, Poland, and Ukraine. According to Polish historian Gerard Labuda, the ethnogenesis of Slavic people is the Trzciniec culture from about 1700 to 1200 BC. The Milograd culture hypothesis posits that the pre-Proto-Slavs (or Balto-Slavs) originated in the seventh century BC–first century AD culture of northern Ukraine and southern Belarus. According to the Chernoles culture theory, the pre-Proto-Slavs originated in the 1025–700 BC culture of northern Ukraine and the third century BC–first century AD Zarubintsy culture. According to the Lusatian culture hypothesis, they were present in north-eastern Central Europe in the 1300–500 BC culture and the second century BC–fourth century AD Przeworsk culture.
The Danube basin hypothesis, postulated by Oleg Trubachyov and supported by Florin Curta and "Nestor's Chronicle", theorizes that the Slavs originated in central and southeastern Europe.