Western Europe since the 11th century, divided Christianity in Europe, and consequently the world, into Western Christianity and Eastern Christianity. With certain simplifications, Western Europe is thus Catholic or Protestant and uses the Latin alphabet. Eastern Europe is Orthodox and uses the Greek alphabet or Cyrillic script. According to this definition, Western Europe is formed by countries with dominant Roman Catholic and Protestant churches, including countries which are considered part of Central Europe now: Austria, Belgium, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
Christianity in Europe its state religion in AD 301. The oldest state-built church in the world, Etchmiadzin Cathedral, was built between AD 301-303. It is the seat of the Armenian Apostolic Church. The Roman Empire officially adopted Christianity in AD 380. During the Early Middle Ages, most of Europe underwent Christianization, a process essentially complete with the Baltic Christianization in the 15th century. The emergence of the notion of "Europe" or the "Western World" is intimately connected with the idea of "Christendom", especially since Christianity in the Middle East was marginalized by the rise of Islam from the 7th century, a constellation that