How do we know that the church is the true Israel of God?

In Scripture, particularly in Galatians 3:7-9, it is stated that those who have faith in Christ are the true children of Abraham, thus forming the Israel of God. This is reinforced in Romans 9:6-8, where Paul explains that not all physical descendants of Abraham are part of God’s covenant people; rather, it is the children of the promise who are counted as his offspring. As the church comprises both Jews and Gentiles who have faith in Christ, it represents the spiritual lineage that God intended, thereby affirming that the church is indeed the true Israel of God.