What is the significance of being called a 'spiritual Israelite'?

The term 'spiritual Israelite' signifies those who belong to the true Israel of God, as outlined in Romans 2:28-29, which teaches that true circumcision comes from the heart, being a matter of the spirit. This signifies that God’s covenant extends beyond ethnic Jews to all who have faith in Christ, regardless of their background. In Galatians 3:29, Paul emphasizes that all who belong to Christ are heirs according to the promise, further illustrating that inclusion in God's people is based solely on faith, thereby fulfilling the promise given to Abraham's seed, which is Christ.