Jesus Christ is the only begotten Son of God (John 3:16). He was begotten by the Holy Spirit through the virgin birth. All who believe on the Lord Jesus Christ are God's adopted children. In Christ alone, God adopts us into His family. We are redeemed, that we might receive the adoption as sons (Galatians 4:5).
God adopts us in Christ to be free from the bondage of sin. At the cross, Jesus died to redeem us from the slavery of sin. Therefore you are no longer a slave but a son (Galatians 4:7). We are adopted as children of God, because of redemption in God's only begotten Son. In Christ alone, we are adopted as children of God.
God's adopt us to have a personal relationship with our heavenly Father. And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying out, Abba Father (Galatians 4:6). The Holy Spirit indwells every believer to confirm our adoption. You experience God the Father's love in your heart as His adopted child (Romans 5:5).
God adopts every believer as an heir of God in Christ (Galatians 4:7). We have a blessed hope for the future. We have a predestined inheritance to be conformed to the likeness of Christ (Galatians 4:7). For whom He foreknew, He also predestined to be conformed to the image of His Son (Romans 8:29). That is our glorification in Christ, as God's adopted children.