Christianity is a world wide religion, and not was restricted to any one area. Jesus left His followers with the Great Commission to go into all the world and make disciples of all nations. Historically, the church spread to Europe very early in the history of the church due to the ease of travel to these areas. Paul's missionary journeys are one example and reason for this. The doctrines of some of the major denominations do originally come from Europe, but now more commonly are built on by those in a wide range of geographical areas. Most denominations share their basic common beliefs that began in the Middle East.
Catholic people do still have Rome as the center of their faith, but there are many others that do not. Protestantism had its origins from the Catholic church and thus grew strongly in European nations. Many Europeans migrated, taking their faith to their new homes.
Christianity originated in europe
Christianity
St. Paul evangelized in Greece and Rome. Greek and Roman cultural elements became incorporated into Christianity (nuns, ritual eating of a slain and resurrected god, a pontiff)
The most wide-spread religion in Europe is Christianity. It started between 50-70 AD and Roman Catholicism became the biggest Christian Denomination in the country.
Monks help spread Christianity across Europe.
The Monroe Doctrine was in direct opposition to the Truman Doctrine. The Monroe Doctrine said the US should not interfere with events in Europe.
One of the distinguishing features of the western Christianity, going back even as far as the second century AD, was that it was not as influenced by Greek philosophical thought as Christianity in the eastern half of the Roman Empire. It helped to give western Christianity different emphases than those found in the eastern Christianity. I cannot think of any substantial change that happened in Christianity in Europe as a result of "Greek philosophical thought being cast out of Christianity in Europe." The biggest change in Christianity in Europe arose from the Reformation. Even on the Catholic side, this resulted in the decisions of the Council of Trent, which eliminated many of the abuses identified by Martin Luther, but without making the changes in doctrine that he called for. The changes in Christianity at the time of the Reformation resulted from closer attention to the teachings of Christ, not from casting out Greek philosophical thought.
The areas of Europe that likely believed in Christianity was the western part of Europe, which is Spain and Italy.
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the economic recovery of Europe.
Christianity
Religious thought and ideas changed somewhat - Lollards, Hussites, Martin Luther and Calvin all rejected, in one form or another, Christian Doctrine as presented by the Catholic Church. However, this is more to do with religious doctrine than philosophy as such.