Actually John calls "the Word" (Logos) was and is God and then in John 1:14 John tells us that the "Word" became flesh and dwelt among us. So, the human being who was born did not exist before he was born. He is called Jesus. The Divine Word created the world in the beginning.John 1:1-3 In the beginning was the Word, and the Word was with God, and the Word was God.
The same was in the beginning with God.
All things were made by him; and without him was not any thing made that was made.
John calls Jesus God. Jesus was before the beginning. Jesus spoke the beginning at the beginning, and created everything that is created.
There is this term in theology called the Hypostatic Union:
In simplest terms, the hypostatic union is a reference to Jesus Christ as both God and man, fully divine and fully human. Hypostasis is the Greek word for subsistence (think: individual existence). The hypostatic union, therefore, is the technical term for the unipersonality of Christ, whereby in the incarnation the Son of God was constituted a complex person with both a human and a divine nature.
I do not deny that Jesus is the Word in human flesh (but now in resurrected flesh), but it was not in human flesh that the Word created everything.
But this brings up another question:
Mal 3:6 "For I am the LORD, I do not change; Therefore you are not consumed, O sons of Jacob.
Did not the Word taking on a human body cause somekind of change?