The Bible is the Only Word of God
Contrary to popular belief, The Bible is the only book in the world that is infallible (without failure). I must admit that there are a multitude of books in the world that claim to be from God and that many of them are called "the Bible." The Bible was written by holy men of old who were moved by the Holy Spirit to physically write it. Around 40 writers were chosen over a period of about 1600 years.
From Moses, who wrote not only of his own experiences, but the entire story of creation forward, by inspiration of God, to John the Apostle, who wrote a Gospel, 3 epistles and the book of Revelation God chosen men who He inspired to write what He wanted written. All scripture is given by inspiration of God.
Everything that our creator wants us to know and understand is contained in this book. The book is justified and verified by everything we touch and see yet it can only be substantiated by our faith in what it says. God knows that the majority of sinners will not respond in faith. This is apparently the main reason that He chose to manifest Himself only in the form of His only begotten son, Jesus Christ.