It has been said that Christianity is actually the worship of the Bible. When one sees the Bible as the source of knowledge necessary to one’s personal salvation, this can easily happen. The sacred text becomes the most important item in our life, the one tangible, physical piece of evidence connecting us to the God who is Spirit and therefore invisible.
If my personal knowledge of the Bible and my obedience to its revelation is necessary to my salvation, then the Bible, in effect, becomes more important than the sacrifice of Christ. Under those circumstances, my knowledge of the Bible and my obedience thereto are ultimately responsible for my enjoying the blessing of redemption.
Without that knowledge and obedience, all the work of Jesus is in vain. It is as if it never happened. The situation mirrors that described by Paul in Galatians 5:4 (Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace). You can readily see that justification by the law is the same as justification by obedience, by personal knowledge, by personal effort, commitment, belief, whatever. Salvation by my obedience trivializes the sacrifice of Jesus, making Him more the martyr to a lost cause than a glorious, victorious Savior. Salvation by knowledge subverts the will of God that none should perish. Salvation by my effort, in whatever form or fashion, makes the redemption plan of God a failure; and this cannot be.