Do you, as a believer, really have faith in God as you claim? Can you command a mountain to move into the sea, to use the analogy of Jesus and, would that really happen? Well, truth of the matter is that we simply do not have faith, just as Jesus constantly admonished His disciples.
We do not have faith in God because we do not trust Him, for faith is actually trust. Furthermore, we do not trust God because we do not really know Him, for it is naturally impossible to trust unfamiliar person.
Jesus equated knowing Him and God the Father to eternal life (see John 17:3). This book is all about helping you to learn about God, so that you may be able to know Him; to trust Him; to have faith in Him.