Why is it unacceptable to argue, a priori, that "The Bible is the Word of God"?
Because the Bible is known
a posteriori.
Also, would you please provide me a succinct statement distinguishing metaphysical and epistemological justification?
Metaphysical justification of knowledge entails an accounting for why we can have knowledge (eg: God imposes knowledge).
Epistemological justification entails an accounting of how that happens
a priori. You cannot have a metaphysical justification unless you first have an epistemological one.
How do you then explain how the soul in its intermediate state can possess knowledge of the world?
Define "intermediate state."
You'll have to provide more than the assertion that this is the sort of doubt of which the Bible speaks. Also, by having the axiom, "The Bible is the Word of God," we are assured that all its propositions, including those deducible by necessary consequence have maximal warrant.
That's a theological axiom, not an epistemological one. Why I say this is that the axiom presupposes the existence of God and of the Christian God. One has to have knowledge of this prior to the axiom.
In addition, I think I've already made it clear that human deduction is fallible and therefore anything that you deduce from Scripture is fallible.
No, we have maximal warrant because God has testified to us in His Word.
Circular--we have maximal warrant for God's word because God has testified to us in His word?
We can know it is His Word because He reveals it directly to us, as you yourself have admitted in the regenerative work of the Holy Spirit.
The regenerative work of the Holy Spirit is demonstrative of the truth of God's word. It constitutes proof in the same way that God sending fire from heaven constituted proof of God's word on Mount Carmel.
But the point is, without revelation, you cannot justify that you know that what you possess is God-given in the first place. We are talking about the justification of knowledge.
Granted, I did give a metaphysical justification there.
Nonetheless, of necessity we are forced to trust them and therefore are unreasonable to doubt them unless given good reason. The burden of proof is on the skeptic to prove that, in a given instance, doubt is reasonable.
So you can know theology by the axiom of the Bible, but you cannot know knowledge by the axiom of the Bible. Such a conclusion seems like alternative theories of epistemology to me. How can you retain both and not lead to incoherence? Is knowledge a divided subject matter?
The Bible is indeed
a source of knowledge about God, provided that we are presupposing the same things that it does.
What I mean to say is that while we can, I think, take the Bible to be a source of knowledge, we are not justified in taking it to be the
only source of knowledge.
As for your second assertion, I'd like to hear you support just how it is that the axiom requires a further presupposition.
In order to assume your axiom, one would have to know enough about the Scriptures to understand that such is the case. Further, as I stated, in order to assume this, one has to already have a knowledge of God. There can be no word of God without God.