Interesting - and revealing - that the OP started by talking about a god, then switched to talking about a book. That the book exists is something all sides agree on; so if this god is the book, or contained within the book, then I agree that that god does exist, in exactly the same way that Gandalf exists. However, worshipping or praying to either would be very silly.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
