After God created the heavens and the earth, He created man and woman in His image (Genesis chapters 1–3). Unlike any of the other things that God created, people were created for an eternal purpose.
Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places, even as He chose us in Him before the foundation of the world, that we should be holy and blameless before Him. In love he predestined us for adoption as sons through Jesus Christ, according to the purpose of His will…(Ephesians 1:3–5).
Before He created the universe, God wanted to add children to His eternal family. So why did He have to “adopt” us?