How can you read the Bible and also not agree that according to it, God is the ultimate authority?
See the italicized bit there, Pauline? I can agree with you just fine on that basis. I can also agree that Harry Potter is a pretty good wizard according to the books that talk about him, or that sandworms are dangerous according to
Dune.
That doesn't mean that any of these agreements impinge on reality, though.
"The wretched world lies now under the tyranny of foolishness; things are believed by Christians of such absurdity as no one ever could aforetime induce the heathen to believe." - Agobard of Lyons,
ca. 830 AD