Early in the Middle Ages, the East Roman Empire and the areas of the former West Roman Empire were primarily Christian, and most of these areas remained Christian. The Christians were mostly Catholic, though there were some other Churches, such as the Celtic Christians. The rest of Europe was mostly pagan.
The spread of Islam quickly turned the Holy Land and North Africa Muslim. Muslims invaded Spain, where they were there in large numbers for the duration of the Middle Ages, and other parts of Europe, such as southern Italy. Meanwhile Christianity spread in Europe toward the North and East, but the Catholic Church underwent strain as the Greek speaking and Latin speaking Churches disagreed about various things.
The Catholic Church finally divided in 1054 into the Roman Catholic Church, in the West, and the Eastern Orthodox Church, in the East. There were also heretical sects, but they did not endure very well during the Middle Ages.
During the entire time of the Middle Ages, there were communities of Jews in many European cities. The Jews were among the best educated people in Europe, and were welcomed into various areas because of the benefits they could provide to the general populations. They did, however, suffer from prejudiced and were expelled from various places because of it.
There are links below to articles with more information.
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Vikings
During the early middle ages, 500 - 1000AD, Europe was a frontier land as it was sparsely populated and undeveloped. ;P
The fall of the Roman empire
middle east and western Europe
No. France is in Western Europe, not the Middle East.
monasteries and roman catholic church
Paris
No, Ireland is located in Western Europe.
Most people of Western Europe, for most of the Middle Ages, were linked by a belief in Christianity, in the communion of the Catholic Church.
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Late Middle Ages in western Europe.
The middle ages- 1000-1500 AD.
Eastern Europe and Western Middle East
Vikings