Some Christians are. Not all of us. I'm not a fan of the "culture warrior" sort of Christians, myself. Funnily, those types aren't actually getting their social positions directly from the Bible.Why are Christians actively protesting abortion, gaymarriage and theory of evolution if the bible is just a book?
Now, the Bible is important, but we have to put it into perspective. The experience of and communion with the living God is more than mere words. The Bible is more of a grand story of humanity approaching and trying to understand God, and God reaching out to us. But it is not the be-all and end-all of humanity's journey with God.
Food for thought: http://www.patheos.com/blogs/emerge...he-word-of-god-a-polemic-against-christendom/