Michael, perhaps Warren was not as elegant as you would have liked in his responses to Piers, but none of us is perfect. He was fairly clear about the authority and perspicuity of scripture versus the changing opinion of the modern world.
Also, please do not use John 7:53-8:11 in an article defending scripture. The manuscript evidence is clear that it was not originally in the text. It is a great story that seems consistent with the character of Jesus, but it should not be used to make theological point like it was scripture. Treating this passage like the rest of scripture leaves you open to the charge that you are not careful with the text which I know you are in other areas.