The Bible. As a teenager, reading this book cover to cover changed my life in a very strange way. It challenged my faith at a very deep level. Plainly there are differences between the Old Testament and the New - in terms of how to live your life. Plainly they can't both be true. So I stopped calling myself a 'Christian' and started to call myself a 'Christ-follower'. Now I would describe myself as a 'gnostic Christian'.