Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Slavic Christianity
Slavic Christianity refers to the history of Christianity among the Slavic peoples. The Slavic nations (or ethnic groups) are divided between Eastern Orthodoxy and Roman Catholicism. The Orthodox Slavs use the Cyrillic script, while the Catholic Slavs use the Latin script. It should be noted that Orthodox Slavs used Slavic language for liturgy from 863, while Catholic Slavs (like other Catholics) - only since the Counter-Reformation.