For those who are willing to see, the divine self-revelation of creation as image and likeness is everywhere evident, long before Scriptures were written. God was not mute for 14 billion years. Even though Abraham didn’t have the Bible (either of the Testaments!), he and Sarah still knew God—which is true for all the Patriarchs and their families. They instead knew God by the relationship called faith, better translated as “trust in goodness.”
Faith is the other side of the coin of revelation. Faith is God’s self-exposure received and responded to trustfully. A genuine act of faith is always in response to a new disclosure. It is meant to be an ongoing dialogue of divine disclosure and human response—an ever deeper divine disclosure and an ever deeper human response—just like any human love affair. People who are incapable of vulnerability thus cannot get very far on the journey of faith. They usually substitute either religion itself or atheistic denial.