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In page Religious pluralism:

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Before the Great Schism, mainstream Christianity confessed "one holy catholic and apostolic church", in the words of the Nicene Creed. Roman Catholics, Orthodox Christians, Episcopalians and most Protestant Christian denominations still maintain this belief. Furthermore, the Catholic Church makes the claim that it alone is the one and only true Church founded by Jesus Christ, but the Eastern Orthodox and Oriental Orthodox Churches also make this claim in respect to themselves.[citation needed]