Well I don't know any Christian that bases they faith on the Bible...they base it on the finished work of Jesus Christ...the Bible is not only a historical record of his life...but presents the message he left that He is the Only way to salvation....he 'IS' salvation.
Even so there's a reason the Bible is seen as the “Living Word”..... .....for In the beginning was the Word, and the Word was with God, and the Word was God.....The Word 'became flesh' and made His dwelling among us...... He is before all things, and in him all things hold together..
Further...For there are three that bear record in heaven, the Father, 'the Word', and the Holy Ghost: and these three are one.
Matthew Henry Commentary states.."The plainest reason why the Son of God is called the Word, seems to be, that as our words explain our minds to others, so was the Son of God sent in order to reveal his Father's mind to the world. What the evangelist says of Christ proves that he is God. He asserts, His existence in the beginning; His coexistence with the Father. The Word was with God. All things were made by him, and not as an instrument. Without him was not any thing made that was made, from the highest angel to the meanest worm. This shows how well qualified he was for the work of our redemption and salvation. The light of reason, as well as the life of sense, is derived from him, and depends upon him. This eternal Word, this true Light shines,.... ..... but the darkness comprehends it not..."
That was substantive.