Unlike any other book, the Bible consistently claims itself to be divinely inspired and to be the Word of God. For example:
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness (2 Timothy 3:16).
Your word is truth (Psalm 119:160; John 17:17).
Every word of God proves true (Proverbs 30:5, RSV).
Scripture cannot be broken (John 10:35).
Forever, O Lord, Thy word is settled in heaven (Psalm 119:89, KJV).
Especially relevant to the purpose of this book, the Bible says of itself:
For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart (Hebrews 4:12).
Not only does the Bible claim to be divinely inspired, in its pages the Creator even speaks in the first person! Expressions such as, "And God said...," followed by a quote appear about 3,800 times in the Old Testament alone, someone has counted.
These claims and characteristics are in a book that espouses truth, morality, and all that is good. It is illogical that such a book would be a hoax, and a conspiracy is impossible because of the vast differences in time and place of the writers and events. Also, of the large number of people involved, someone would have surely spoken up.