An N T Wright quote I like on the purpose and authority of the Bible in the Christian Movement.
We live under scripture because that is the way we live under the authority of God that has been vested in Jesus the Messiah, the Lord.
But what is God’s authority there for? Certainly not to give us a large amount of true but miscellaneous information. Solomon made lists of natural phenomena, but they didn’t get into the Bible. The Bible is not an early version of the Encyclopædia Britannica. Here is the central element: the point about God’s authority is that the whole Bible is about God establishing his kingdom on earth as in heaven, completing (in other words) the project begun but aborted in Genesis 1–3. This is the big story that we must learn how to tell. It isn’t just about how to get saved, with some cosmology bolted onto the side. This is an organic story about God and the world.
God’s authority is exercised not to give his people lots of true information, not even true information about how they get saved (though that comes en route). God’s authority, vested in Jesus the Messiah, is about God reclaiming his proper lordship over all creation. And the way God planned to rule over his creation from the start was through obedient humanity. The Bible’s witness to Jesus declares that he, the obedient Man, has done this. But the Bible is then the God-given equipment through which the followers of Jesus are themselves equipped to be obedient stewards, the royal priesthood, bringing that saving rule of God in Christ to the world.