Roman Catholic
Christianity followed by Islam are the widely practiced religions in Europe.
Buddhism Hinduism and Confuscianism are eastern religions. Although practiced in the west, they are not western religions. Western religions are those initiated in Europe and the western portion of the middle east. Christianity and Judaism are 'the' western religions, although certain minor religions (Druids, Norse myth) are western religions. Western religions do not include the indigenous religions of the western hemisphere. Islam is generally not considered a western religion, although being an Abrahamic religion, is considered western by some.
The main religion in Europe are Christianity, Islam and a little bit of Hinduisim.
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.
The Aryan peoples stretched across Europe into western Asia. They had many religions.
Christianity is the most widely practiced religion in Europe
Christianity is the biggest religion in Europe, but there are many religions in Europe.
Catholicism.
Catholicism.
Paganism. But technically I could also say things like Samaritan-ism, Zoroastrianism, Druze, Hinduism, religions which are mainly ethnic in nature and which don't exist in any large amounts in western Europe. Although, Hinduism may be an exception to that, but compared to the percentage of the other religions, I doubt Hinduism make s much of a splash in Western Europe.
During the Iron Age, many different religions were practiced around the world. Some examples include ancient Greek and Roman polytheistic religions, Norse mythology in Scandinavia, Celtic polytheism in Western Europe, Hinduism in the Indian subcontinent, and various indigenous belief systems in the Americas, Africa, and Asia.
Catholicism.