Those of us who place our trust in Christ alone to stand righteous before God the Father have been adopted into the family of God. God's redemption plan is adoption. Yet adoption is also the means by which our redemption is secured. Russell Moore writes:
Joseph is not Jesus' biological father, but he is his real father. In his adoption of Jesus, Joseph is rightly identified by the Spirit speaking through the Scriptures as Jesus' father (Luke 2:41, 48)...
if Joseph is not "really" the father of Jesus, you and I are going to hell.
Jesus' identity as the Christ, after all, is tied to his identity as the ancestor of David, the legitimate heir to David's throne. Jesus saves us as David's son, the offspring of Abraham, the Christ. That human identity came to Jesus through adoption.1
Stand firm in Christ,
1. Moore, Russell D. Adopted for Life: The Priority of Adoption for Christian Families & Churches. Page 67.