How do we know that God makes Gentiles spiritual Jews?

We know that God makes Gentiles spiritual Jews through the testimony of Scripture. In Romans 11:5, it is stated, 'Even so then at this present time also there is a remnant according to the election of grace.' This verse emphasizes that God's sovereign grace ensures that Gentiles, along with Jews, are included in His redemptive plan. The apostles' teachings, as seen in the letters to the Ephesians and Galatians, reinforce this truth, revealing that all who believe in Christ are recipients of His promises and are made part of spiritual Israel.