Religion in Europe (194,000) which is home to Eastern Europe's largest Jewish community. During the Enlightenment, Deism became influential especially in France, Germany, the Netherlands, and the United Kingdom. Biblical concepts were challenged by concepts such as a heliocentric universe and other scientific challenges to the Bible. Notable early deists include Voltaire and Kant . The trend towards secularism during the 20th and 21st centuries has a number of reasons, depending on the individual country: The trend towards secularism has been less pronounced in the traditionally Catholic countries of Mediterranean Europe. Greece as the only traditionally Eastern Orthodox country in Europe which has
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