Why is understanding spiritual Israel important for Christians?

Comprehending the concept of spiritual Israel is critical for Christians, as it reveals that the distinction of being God’s people is not confined to ethnic boundaries but is determined by faith in Christ. Paul discusses this in Romans 2:28-29, stating that a true Jew is one inwardly, whose circumcision is of the heart. This spiritual understanding addresses the misconception that physical lineage equates to divine favor. It reassures believers that they are counted among God's people by grace alone, reinforcing the foundational Reformed tenet of salvation through faith apart from works. Being spiritually united with Christ as heirs guarantees believers a place in God’s covenant, shaping their understanding of identity and mission.