As a late comer here, and reading both your exchanges, I'd like to add an important point from the Catholic point of view to the above:
The proof comes from the Divine Grace of God working through Divine Faith. Otherwise there would be no reason for Divine "Faith".
Take this line from your (xzins) Post 70:
Where would you place "the full inspiration of scripture by God?" I would give it a 10.
I would give it a 10 too, except the proof comes from the Grace of God working through Faith in me. From the Holy Scriptures themselves, read by an individual separated from the Church, it's not possible to consider giving it a 10. The Scriptures themselves, particularly the New Testament, don't give me the information on just what Books are supposed to be there and which are not. It is the living, Divinely instituted Church, led by the Holy Spirit which authoritatively, the Authority of Christ no less, can tell me and others which Books are the Canon of Holy Scripture.
A non-Christian not open to Faith would just consider your "proofs" of the Bible being the Word of God as being "rationalizations".