Every religion has its own book or books. The Moslem Religion has the Koran. The Buddhist religion has its Zend Avesta. The Mormons have the writings of Joseph Smith. Cults springing up across the nation each have their own books.
The Christian has his own book, also. The Christians book is the Bible. All other religions find man at the center of its belief. Man reaching out to god. Christianity, on the other hand, finds God reaching down to man. The center of the Bible is not man, but rather the Godman, Jesus Christ.