Why is Abraham's faith significant in the Bible?

Abraham's significance in scripture stems from his embodiment of faith in God's promises, notably seen in Romans 4 and Galatians 3. He believed God's word that he would inherit the land and have descendants, despite his old age and barrenness of his wife Sarai. This faith was credited to him as righteousness, highlighting the principle of justification by faith alone. Abraham’s journey is a model for all believers today, illustrating that true faith is reliance on God's sovereign promises, not on our own understanding or capabilities.