I do not believe in the pre-existence of Jesus, but that he is literally the Son of God because God the Father is His father in the conception / birth process and Mary was His mother Matthew 1:20-21, Luke 1:34-35, John 1:14. Just as any child that has been born, we do not think of the child pre-existing, so with Jesus He was conceived and born and grew in wisdom and understanding Luke 2:40,52.
Do you believe that Jesus was anointed as the Christ?
"Moreover, brethren, I do not want you to be unaware that all our fathers were under the cloud, all passed through the sea, all were baptized into Moses in the cloud and in the sea, all ate the same spiritual food, and all drank the same spiritual drink. For they drank of that spiritual Rock that followed them, and that Rock was Christ." (1 Corinthians 10:1-4)