What does Adoptionism teach? Is it biblical?

from the old testament

• Psalm 2:7 describes God’s Son in the context of royal enthronement, where the Son is publicly declared and installed as king rather than created or adopted at that moment.
• Isaiah 9:6 calls the Messiah “Mighty God” and “Everlasting Father,” titles that belong to Yahweh Himself and therefore cannot be explained by adoption or exaltation of a merely human figure.
• Isaiah 42:8 and Isaiah 48:11 make clear that God does not give His glory to another, emphasizing the uniqueness and exclusivity of His divine identity. If the Messiah truly bears divine glory and exercises divine authority, then He must share in God’s nature rather than simply receiving honor or favor as an adopted son.
• Micah 5:2 states that the ruler who will come from Bethlehem has origins “from of old, from ancient days,” which points to real preexistence rather than a beginning at birth, baptism, or resurrection. This language rules out the idea of later adoption.

from the new testament

• Jesus eternally existed before creation and was active in creating and sustaining all things (Colossians 1:16–17).
• John identifies Jesus as God who existed “in the beginning” and who later took on human flesh (John 1:1, 14).
• Scripture also speaks of God sending His Son into the world, which assumes that Jesus was already the Son before His incarnation (John 3:16).
• Jesus was not a human who later became divine, but the eternal divine Son who later added humanity to Himself (Philippians 2:6–7). For this reason, Jesus did not receive Sonship through adoption; He has always been the Son of God.

implications for today

Adoptionism is the teaching that Jesus was originally a mere man who lived faithfully and was later adopted by God as His Son, often said to occur at His baptism or resurrection. In this view, Jesus’ divine status is not essential to His identity but something conferred upon Him at a point in time. This directly conflicts with the New Testament’s presentation of Jesus as the eternal Son, fundamentally altering who Christ is.

Historically, adoptionist ideas appeared early in the church’s life, most notably in the second century with figures such as Theodotus of Byzantium, who taught that God empowered Jesus because of His righteousness. Similar views resurfaced periodically, including a notable revival in eighth-century Spain. Each time, the church recognized that adoptionism was a significant Christological error that undermined Scripture. This is why it has always been rejected as a heresy.

Jesus must be fully God and eternal, or else there is no saving gospel. If Jesus were only a man later adopted by God, He could not fully reveal God or act with God’s authority. A created being cannot speak definitively for God (Hebrews 1:1–2) or forgive sin (Mark 2:7). Also, no matter how good Jesus might have been, since all of humanity is born corrupted (Romans 5:12), if He were first human, then He also would have been corrupted at birth. Thus, He would have had to die for His own sin and could not have saved anyone else.

However, because Jesus is the eternal Son who took on human nature, He was born without corruption (Luke 1:35) and thus able to live the perfect life that we cannot. Since death is only required of sinners (Romans 6:23a), Jesus did not have to die. Yet that was why He came, and He willingly obeyed His Father and died for sinful men and women. This is why Scripture places such a strong emphasis on Christ as fully God and fully man. It is because it is only Jesus who can save.