The Church puts the authority of God above that of the Bible, and Catholics believe that, in one way or another, the Church is being guided by the Holy Spirit and protected from straying off into evil. Note that the realm of infallibility thus created is extremely narrow and has only bene invokved, IIRC, two or three times in the couple thousand years the Church has existed.
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Also, FWIW the Church predates the Bible by a fair bit.