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In page Slavs:

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The pagan Slavic populations were Christianized between the 7th and 12th centuries. Orthodox Christianity is predominant among East and South Slavs, while Catholicism is predominant among West Slavs and some western South Slavs. The religious borders are largely comparable to the East–West Schism which began in the 11th century. Islam first arrived in the 7th century during the early Muslim conquests, and was gradually adopted by a number of Slavic ethnic groups through the centuries in the Balkans.[citation needed]