Why is the example of Abraham significant for Christians?

Abraham is significant for Christians because he is considered the father of all believers, illustrating that justification is attained through faith, not by works. In Romans 4, Paul appeals to Abraham's experience to demonstrate that righteousness is given to those who have faith in God. His belief is held up as an example, serving to show that even the patriarchs needed faith in God's promises rather than reliance on their own abilities or adherence to the law for righteousness. This underscores a foundational truth of sovereign grace theology: it is only through believing God that we are justified.