The Bible itself says that God was its author and that He guided its writers what to write. If the writing of the Bible was not guided by God – word by word – then what the Bible says about God and His dealings with men would be unreliable. If the Bible is not the authoritative ‘Word of God’ Himself in all its parts, it is far less valuable as a guide in spiritual things and to help people gain salvation.
A fundamental Christian belief
The Bible, consisting of the Scriptures of Moses, the prophets, and the apostles, is the only reliable source of knowledge concerning God and His purposes. The Bible itself makes the claim that God is its author and that He inspired the writers to write it. If that claim is true, then the Bible must be totally without error in all its parts except where copiers and translators have made mistakes.