Why does Ephesians say there is one God and Father of all?

In Ephesians 4:6, the declaration of one God and Father serves to unify believers under the recognition of God's sovereignty. This emphasizes that there is one divine authority who presides over all things, creating a foundational truth for Christian faith. In acknowledging that God is 'above all, through all, and in you all,' we recognize His involvement in our lives and in the unfolding of history. This concept reassures believers that nothing is outside of His control and that He orchestrates everything for His glory and the benefit of His people.