The main religion in Europe are Christianity, Islam and a little bit of Hinduisim.
Christianity followed by Islam are the widely practiced religions in Europe.
Roman Catholic
Anglican, Catholicism, Islam and many other minor religions.
The three most practiced religions in Europe are Christianity, Islam, and Judaism in that order. Many Europeans are also non-religious, and if that counted as a religion, it would place second in number of practicers.
Islam.
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christianity
jews
Religions practiced in Greece in percentages - Greek Orthodox 98%, Muslim 1.3%, other 0.7%.
There is Catholic and Penticostal primary religions.
Italy is a predominantly Catholic country but most other religions are practiced there as well.
There were three major religions found in medieval Europe. They were Judaism, Islam and Christianity. Of course there were many other religions practiced but these three represented the majority of the population.