Christ already existed even before the creation (Ephesians 1:4) “Explaining the will that God had even before the creation, Paul said, “In the dispensation of the fullness of the times He might gather together in one all things in Christ, both which are in heaven and which are in earth – in Him” (Ephesians 1:10).To fulfill His will , God sent His only begotten son whom He had promised and who would be anointed ,to this earth .Ephesians 3:9 “And to make all men see what is the fellowship of the mystery (secret) ,which from the beginning of the world has been hidden in God, who created all things by Jesus Christ”.
Jesus Christ has not only existed even before creation, but He has existed as the eternal and true God. Further more, even though He came to this earth in the flesh of a man, He continued to be God Himself, read (John 1:1, 14). As Romans 9:5 states; “(He) who is over all, the eternally blessed God. In Mathew 9:2, Jesus said, “Son, be of good cheer; your sins be forgiven you” – who has the power to declare forgiveness of sins apart from God?
Further more, Paul also said, “(Christ Jesus) who being in the form of God did not consider it robbery to be equal with God”. (Philippians 2:6). John, while praising Christ, also confessed, “And we know that the Son of God has come and has given us an understanding, that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life” (1 John 5:20). When Caiaphas the high priest asked Jesus, Tell us if you are the Christ, the Son of God”, Jesus answered him, “it is as you said”(Mathew 26:63-64) see also (Mark 15:2).
On other occasions, Jesus also said that He and God were one (John 10:30, and that He had existed before Abraham (John 8:58). Christ moreover, mentioned His role as the High Priest and the glory that He has shared with the Father even before the creation (John 17:5). In addition, when Christ forgave people of their sins or healed them from their illnesses, as well as when He admonished His disciples to believe in Him, all these things were contingent upon their recognition of His divinity.
Finally, I should say; Jesus Christ is the second person of the Triune God who worked as the Son of God in the salvation plan of God (Mathew 26:63-64)