I understand Jesus to be the eternal Word of God thru whom God created the universe, and that He became the Son of God at His Incarnation. Is this heresy?
While there are Christians on both sides of this debate, there is considerable biblical evidence to support the eternal Sonship of Christ. First of all, there are many passages that clearly identify that it was “the Son” who created all things (
Colossians 1:13-16;
Hebrews 1:2), thereby strongly implying that Christ was the Son of God at the time of creation. When one considers these passages, it seems clear that the most normal and natural meaning of the passages is that at the time of creation Jesus was the Son of God, the second Person of the Triune Godhead, thus supporting the doctrine of eternal Sonship.
Second, there are numerous verses that speak of God the Father sending the Son into the world to redeem sinful man (
John 20:21;
Galatians 4:4;
1 John 4:14;
1 John 4:10) and giving His Son as a sacrifice for sin (
John 3:16). Clearly implied in all the passages that deal with the Father sending/giving the Son is the fact that He was the Son before He was sent into the world. This is even more clearly seen in
Galatians 4:4-6, where the term “sent forth” is used both of the Son and the Spirit. Just as the Holy Spirit did not become the Holy Spirit when He was sent to empower the believers at Pentecost, neither did the Son become the Son at the moment of His incarnation. All three Persons of the Triune Godhead have existed for all eternity, and their names reveal who they are, not simply what their title or function is.
Third,
1 John 3:8 speaks of the appearance or manifestation of the Son of God: “the one who practices sin is of the devil; for the devil has sinned from the beginning. The Son of God appeared for this purpose, that He might destroy the works of the devil.” The verb “to make manifest” or “appeared” means to make visible or to bring to light something that was previously hidden. The idea communicated in this verse is not that the second Person of the trinity became the Son of God, but that the already existing Son of God was made manifest or appeared in order to fulfill God’s predetermined purpose. This idea is also seen in other verses such as
John 11:27 and
1 John 5:20.
Fourth,
Hebrews 13:8 teaches that “Jesus Christ is the same yesterday and today, yes and forever.” This verse again seems to support the doctrine of eternal Sonship. The fact that Jesus’ divine nature is unchanging would seem to indicate that He was always the Son of God because that is an essential part of His Person. At the incarnation Jesus took on human flesh, but His divine nature did not change, nor did His relationship with the Father. This same truth is also implied in
John 20:31, where we see John’s purpose in writing his gospel was so that we might “believe that Jesus is the Christ, the Son of God; and that believing you may have life in His name.” It does not say that He became the Son of God but that He is the Son of God. The fact that Jesus was and is the Son of God is an essential aspect of Who He is and His work in redemption.
Finally, one of the strongest evidences for the eternal Sonship of Christ is the triune nature of God and the eternal relationship that exists among the Father, Son, and Holy Spirit. Particularly important is the unique Father/Son relationship that can only be understood from the aspect of Christ’s eternal Sonship. This relationship is key to understanding the full measure of God’s love for those whom He redeems through the blood of Christ. The fact that God the Father took His Son, the very Son He loved from before the foundation of the world, and sent Him to be a sacrifice for our sins is an amazing act of grace and love that is best understood from the doctrine of eternal Sonship.
One verse that speaks of the eternal relationship between the Father and Son is
John 16:28. "I came forth from the Father, and have come into the world; I am leaving the world again, and going to the Father." Implied in this verse is again the fact that the Father/Son relationship between God the Father and God the Son is one that always has and always will exist. At His incarnation the Son “came from the Father” in the same sense as upon His resurrection He returned “to the Father.” Implied in this verse is the fact that if Jesus was the Son after the resurrection, then He was also the Son prior to His incarnation. Other verses that support the eternal Sonship of Christ would include
John 17:5 and
John 17:24, which speak of the Father’s love for the Son from “before the foundation of the world.”
www.gotquestions.org/eternal-Sonship.html