The Word became flesh and lived among us. We saw his glory, such glory as of the one and only Son of the Father, full of grace and truth.
The word of God became flesh when Jesus was born and proclaimed to the world what God commanded him. Jesus is commonly described the Word of God. It seems right to me if it means that Jesus publicly proclaimed God’s Word, the most important of which would be the coming of the Kingdom of God and the salvation of the people. But that does not mean that Jesus was already the same as the Word before his birth.
God’s message of salvation became concrete:
1 Jhn 1:1-2 That which was from the beginning, that which we have heard, that which we have seen with our eyes, that which we saw, and our hands touched, concerning the Word of life. 2 This life was revealed to us, and we have seen it and testify about it. We declare to you this eternal life that was with the Father and was revealed to us.
In AD 451 Chalkedon it was defined that Jesus has the nature of both God and man, so that He is completely God and completely human. This was largely influenced by the old Greek, Roman and Egyptian religions. The Pharaohs were gods, the Roman emperors proclaimed to be gods, and Paul and Barnabas together caused the people worship themselves and speak of them as gods who came down on earth as Zeus and Hermes (Acts 14:11). The Greek idea of godhood then strengthened in Christianity and Christianity received its doctrinal content.
Next: What is the word?