Colonialism.
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Mostly Christianity.
Protestant, however, religious tolerance was widely accepted and many religions were practiced.
They practiced slavery and different religions. The most comon religion was the Protestant religion.
Anglican, Catholicism, Islam and many other minor religions.
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.