if you believe in a supreme being there are three choices: Pagan, Jewish, or Christian. If you believe in the God of Abraham, Isaac, and Jacob, you are either Jewish or Christian. If you reject Jesus as the Messiah and the authority of the of the New Testament than you are a Christian. If you are a Christian there are three choices: prot, Protestant, or Catholic. If you are capable of intelligent discussion, are able to use unbiased secular sources, and are not a virulent anti-Catholic bigot, you are either protestant or Catholic. If you accept the legitimate teaching authority of Sacred Tradition, the Magisterium and Sacred scripture, all on EQUAL footing than you are Catholic.
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I understand the need for Catholics to categorize in order to assign beliefs and their internal fear of those they can't, but true followers of Christ existed long before there was a Catholic Church and there will be long after the Catholic Church is history.