It is not spelled out in Scripture, explicitly or otherwise... that is why you cannot support your belief that God is Christ and that Christ is God, by applying that belief to the Holy Trinity.
Christ is the Messiah who we have known as Jesus, Son of the Godhead or 'trinity'.
as we read...
John 1:1-3,10,11 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...He was in the world, and the world was made by him, and the world knew him not. He came to his own, and his own received him not.
1 Tim 3:16 And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached to the Gentiles, believed on in the world, received up into glory.
Heb 1:1,2 God, who at sundry times and in divers manners spoke in time past to the fathers by the prophets, Has in these last days spoken to us by his Son, whom he has appointed heir of all things, by whom also he made the worlds;
Rv.22:13 I am Alpha and Omega, the beginning and the end, the first and the last...I Jesus have sent my angel to testify to you these things in the churches.