[Arthur McGowan]

If a person says: “I believe ONLY what the Bible says; everything else is man-made doctrine” he is contradicting himself, because the doctrine that the Bible teaches EVERYTHING that a Christian needs to believe is not in the Bible, and is therefore a man-made doctrine.

[ravenwolf]

EVERYTHING that a Christian needs to believe is not in the Bible, and is therefore a man-made doctrine.

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What does a Christian need to know that is not in the Bible?