If you do not believe the whole Bible is inerrant then we should just throw all of it out. Who are we to pick and choose what God really said and what He didn;t.Who are we to tell God want He must think or say?
What we need to keep in mind is the history and context of each book and understand how these things shape the authors' motivations for writing the books. Revelation, for example, makes much more sense as a condemnation of the evils of the Roman Empire than a quasi-literal prophecy of events that haven't happened yet.