What does the Bible say about being a child of Abraham?

According to Galatians 3:7, 'Know ye therefore that they which are of faith, the same are the children of Abraham.' This illustrates that being a child of Abraham is not tied to physical descent but to spiritual faith. Just as Abraham believed God and was counted righteous, so too are all who believe in Christ. This theological construct emphasizes that faith is the true marker of being a child of God, fulfilling the promise made to Abraham that through him, all nations would be blessed.