For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
I believe the word of God became flesh and the Holy spirit incarinated it with mary
Also, God did speak in the plural form at the creation of man. God wasn't alone.
Then God said, "Let Us make man in Our image, according to Our likeness; let them have dominion over the fish of the sea, over the birds of the air, and over the cattle, over all the earth and over every creeping thing that creeps on the earth."
John 1 King James Version (KJV)
1 In the beginning was the Word, and the Word was with God, and the Word was God.
2 The same was in the beginning with God.
3 All things were made by him; and without him was not any thing made that was made.
4 In him was life; and the life was the light of men.
5 And the light shineth in darkness; and the darkness comprehended it not.
6 There was a man sent from God, whose name was John.
7 The same came for a witness, to bear witness of the Light, that all men through him might believe.
8 He was not that Light, but was sent to bear witness of that Light.
9 That was the true Light, which lighteth every man that cometh into the world.
10 He was in the world, and the world was made by him, and the world knew him not.
11 He came unto his own, and his own received him not.
12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
Jesus was there in the beginning. He was with God during the creation of the world. He appeared in the burning furnace. Daniel 3:25.
We must note that the Trinity have been in existence since..
But one has been in the "main lead role" during some point in time and the others in "supporting role".
God the Father was dominant through out the old testament.
God the Son - Jesus Christ - was dominant during the new testament and
God the Holy Spirit is dominant now.