Trinitarians often claim that Jesus is only called the Son of God because of His birth in Bethlehem. But being born in human flesh, Christ became the “Son of man” at His incarnation, not the “Son of God” which He already was. Scripture reveals many times and in many ways that Jesus was God's Son “before” God sent Him into the world, not after. The following verses for instance say that God sent His Son into the world meaning He was God's Son before He sent Him.
“… because that God sent his only begotten Son into the world, that we might live through him.” 1 John 4:9
“For God sent not his Son into the world to condemn the world; but that the world through him might be saved.” John 3:17
Scripture also informs us that Jesus was the Son of God before all things were created. Paul wrote in regards to Christ that, “He is the image of the invisible God, the firstborn over all creation.” Colossians 1:15 NKJV. Note that the latter part of this verse is poorly translated in the KJV which says, “Who is the image of the invisible God, the firstborn of every creature.” Colossians 1:15 KJV. As a result there are some who use the King James Bible to imply that Christ Himself was a created being. But such an interpretation is contradicted elsewhere in Scripture such as John 1:1-4 and Colossians 1:16-17
Thus we see that Paul is telling us that Christ was “Begotten First or Born Before all creation” because all of creation was by God through His Son Jesus Christ. “And to make all men see what is the fellowship of the mystery, which from the beginning of the world has been hid in God, who created all things by Jesus Christ.” Ephesians 3:9
Ellen White confirms also needless to say.
“The dedication of the first-born had its origin in the earliest times. God had promised to give the First-born of heaven to save the sinner.” — (E.G. White, DA, p. 51)
“God sent His own Son in the likeness of sinful flesh, liable to physical infirmities, tempted in all points like as we are. He was the Son of the living God. His personality did not begin with His incarnation in the flesh.” — (E.G. White, Lt77, Aug 3, 1894)
Thayer's Greek Lexicon says, “Christ is called, firstborn of all creation, who came into being through God prior to the entire universe of created things.” Barnes New Testament Notes on Colossians 1:15 says, “the word firstborn - pro-tot-ok'-os - properly means the firstborn child of a father or mother.” Jamieson, Fausset and Brown Commentary says, “Begotten (literally, 'born') before every creature.” Matthew Henry's Commentary states “He was born or begotten before all the creation, before any creature was made;”
Scripture refers to Jesus Christ as “the image of God,” “the image of the invisible God,” and “the express image of his person.” (2 Corinthians 4:4; Colossians 1:15; Hebrews 1:3). An image is never the original but always a likeness or duplication of the original. Christ is the Son of God and therefore the express image of His Father. It would be incorrect to say that the Father is the image of His Son because the Father is the original. In the same manner it would be incorrect to refer to Christ as the true or original God since He is the image of the true God.
The Bible refers to Christ as God's Son at least 120 times. Forty seven times using the phrase “Son of God.” Regarding the genuineness of Christ's Sonship, He is called the “only begotten” six times, “the firstborn” three times, “the firstbegotten” once and God's “holy child” twice. Four verses say He was “begotten” prior to His incarnation so this cannot be applied to His birth on earth from Mary as some have chosen to believe. Four verses say that He “proceeded forth from,” “came out from” or “camest forth from” the Father. The evidence on this subject is overwhelming. Christ truly is the literal begotten Son of God who was brought forth from the Father before all creation. The example verses below with the help of the Thayer dictionary also reveal that Jesus was born of the Father before the world was, then much later, He came into the world.
Thayer's Greek-English Lexicon
G1831 - To come forth from physically, arise from, to be born of.
G2064 - To come from one place to another.
John 8:42 “Jesus said unto them, If God were your Father, you would love me: for I proceeded forth [G1831] and came from God; neither came [G2064] I of myself, but he sent me.”
John 16:27-28 “For the Father himself loveth you, because you have loved me, and have believed that I came out [G1831] from God. 28 I came forth [G1831] from the Father, and am come [G2064] into the world: again, I leave the world, and go to the Father.”
John 17:7-8 “Now they have known that all things whatsoever you have given me are of you. 8 For I have given unto them the words which you gavest me; and they have received them, and have known surely that I came out [G1831] from you, and they have believed that you did send me.”