I believe:
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the Bible is in some sense authoritative
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Yes, in some sense
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that the Biblical books supply a revelation of God, not by being totally inerrant or morally flawless, or even by being theologically complete, but by using even error and false religious ideas to reveal God. I believe that the contradictions, doublets, errors of fact, and variant accounts of the same things, have a positive theological function. I think attempts at harmonisation are a bad idea in principle.
Whether there was one single Isaiah, or 2, or 3, or 12, or 20, or more, is ISTM of no importance compared to the fact of the book’s Divine Authorship. Not that its human authorship is of no importance or interest; but its Divine Authorship is what gives it authority for God’s People.
I don’t expect total inerrancy from the Bible, nor perfect morality nor perfect and complete theology. I expect Divine Authoritativeness, even if it is clothed in human errors. I think it is a mistake to argue that God is Perfect, therefore all God’s Acts are Perfect, therefore God’s inspiring of Scripture is Perfect, therefore the “God-breathed” Scriptures are free from all error.
I believe that the Bible is “the Word of God in the words of men” - and that because men are flawed, so are their works, and so, therefore, is the Bible. The fact of the many imperfections in its transmission, translation, editing, commentating, and so forth, makes it likely that the Divine Books, far from exempt from the flaws of which its transmission is full, are inseparable from that transmission, and share fully in its imperfections.
I think that the Biblical books differ from all other books, not in being alone inspired, unlike all those others; but in their purpose and their Divine Authority. I don’t think the difference between the Bible OTO, and great literature OTOH, is that it is inspired and they are not. I think there are degrees of inspiration: within the Bible, within other books, between those others, and between them and the Bible. I think Biblical inspiration is a special instance or application of a normal, or maybe universal, Divine action.