I understand better now.
My critique of Arachnophilia is that he is using scientific understanding as the arbitrator of scriptural interpretation.
I think there's two things you're saying:
1. When interpreting the bible, we use human powers of reason (of course, we're human).
2. When JUDGING the bible, Arach uses a combination of his interpretation (taken via reason) and scientific knowledge. When they don't match, I'm sure Arach double-checks his scholarship, the scientific knowledge and, if they're still conflicting, concludes that the Bible is simply not describing reality, i.e. is wrong.
Then you're saying that classical literalists take a different way; when they come across a discrepency between scientific knowledge and their interpretation of the bible, then, because their most basic assumption is that the Bible cannot be wrong, they assume that there's error in either:
1. Their interpretation of the bible
2. The scientific knowledge
Let me know if this summary is not quite right. Thanks for the info.