Alan Jacobs jokes (I think) in this very short post that “Christians are not influenced by books, at all.”
Asking if that assessment is true may be, and most likely is, the wrong question. But there is truth in it. Books, as a means of influence, appear to be far down on the list of sources shaping the heart, mind, soul and body of Christian people. Personality, various forms of popular culture, and the internet lead the way.
But there are still those of us who read books, are influenced by them, and then spread those ideas, either through lifestyle or in conversation, to those around us. The influence may not be direct, but indirect.