Have you not read, ‘Faith cometh by hearing, and hearing by the Word of God?’ Is the Bible The Word of God? Before the New Testament was written down, exclaiming Jesus as Messiah and Savior and Lord, all the faithers had was the Old Testament, the Septuagint probably for most, except maybe guys like Saul who studied under Gamaliel. When the New Testament witness Gospels and letters were then available, the saved ‘cometh by hearing, and hearing by The Word of God.’
Why do you contradict Scripture?