I agree with you to a point that the only value to be found from the Bible is metaphorical, or I would suggest as a sociological study of mans struggle to understand the world and his place in it. As the most famous book of the western world it is indelibly entwined in our culture. Whether what it contains is true or not, inspired or not, it is part of our cultural heritage.
However, how can you make the claim that it dishonours God? First you have to demonstrate that he exists. Secondly you would have to demonstrate what God actually wants/feels/command in order to contrast that with what the human writers of the Bible claimed he wants/feels/commands, in order to show there is a difference and that the Bile is this dishonouring him or misrepresenting him in some way.