Why Biblical Inerrancy?

I think we (or at least some of we ; - ) can safely say that God inerrantly communicates what he intends to his own if we read the Bible, not unhitching the OT from the New, in the manner that Dietrich Bonhoeffer approached it:

Or, we can read it like someone working on their dissertation for a lit crit PhD and get no practical or personal good from it.