What is the origin of the Roman Catholic Church?

What is the origin of the Roman Catholic Church?
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What is the origin of the Roman Catholic Church? Is the Catholic Church a mixture of true Christianity with other non-Christian religions?
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Video used in the Bible teaching:
20230312 CATHOLICS ARE NOT CHRISTIANS
https://rumble.com/v2cwufs-20230312-catholics-are-not-christians.html
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Source: "Got Questions Ministries"
https://www.youtube.com/watch?v=xCdrGWurdoQ
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