The Quiet One,
I think your link is the standard argument against, mine the standard argument for.
It's interesting that you would say "....proven directly from scripture...."
I looked up how Agnostic is defined...
a person who holds that the existence of the ultimate cause, as god , and the essential nature of things are unknown and unknowable, or that human knowledge is limited to experience. If knowledge is limited to [personal] experience then nothing can be proven directly from scripture. Something that is, I believe related, when looking at the bible and trying to understand it I don't bring a lot of " made sense to me" or "judge reasoning based on...... its own merit." along. I, instead, look more for "does it make bible sense".
As a believer I want to know what the bible says, not what makes sense to my very limited human mind.
I believe in the full sovereignty of God. This is his sandbox. His rules, not mine.
Peace