Christianity is not a religion of the book, as one might perhaps speak of Islam; rather, the Christian faith is ultimately about a person.
This is perhaps more controversial than it seems, because certain Christian traditions (reform comes to mind) would argue that Christianity is very much a book religion. However, without a theology of encounter (something articulated well from a Pentecostal faith tradition but lacking in the reform tradition) our faith, becomes bound to and limited by a truncated understanding of sola Scriptura.