I needed to find where it indicates that God is a trinity:
Genesis 1:26: "Then God said, 'Let Us make man in Our image, after Our likeness ...'"
Genesis 3:22: "Then the LORD God said, 'Behold, the man has become like one of Us, knowing good and evil...'
Genesis 11 "Come, let Us go down and there confuse their language, so that they will not understand one another's speech"
However, it does not appear to be "proof" that God The Father is the Head of the Godhead?
Then there is this:
1 Corinthians 11:3: "But I want you to know that the head of every man is Christ, the head of woman is man, and the head of Christ is God."
This is where things can get a bit tricky:
God the Trinity (all three) or God The Father ...
I think the safest way to handle this is to let Scripture say what it says and not try to force more into one verse than that verse is saying.
The “Us” passages in Genesis do show something more than a bare singularity in God. Genesis 1:26 says, “Let us make man in our image, after our likeness.” Genesis 3:22 says, “Behold, the man is become as one of us.” Genesis 11:7 says, “Go to, let us go down, and there confound their language.” I do believe those passages fit with the fuller revelation of Father, Son, and Holy Ghost, but by themselves they are not the clearest place to prove the whole doctrine.
The clearer proof comes when the Bible shows the Father, Son, and Holy Ghost together, yet distinct. At Jesus’ baptism, the Son is baptized, the Spirit descends, and the Father speaks from heaven: “This is my beloved Son, in whom I am well pleased” Matthew 3:17. That is not Jesus talking to Himself. The Father is distinct from the Son, and the Spirit is distinct from both.
But Scripture also says Jesus is truly God. John 1:1 says, “the Word was with God, and the Word was God.” John 1:14 says, “the Word was made flesh.” Thomas said to Jesus, “My Lord and my God” John 20:28. Colossians 2:9 says of Christ, “For in him dwelleth all the fulness of the Godhead bodily.” So whatever we do with 1 Corinthians 11:3, we cannot make it cancel those verses.
When 1 Corinthians 11:3 says, “the head of Christ is God,” I believe “God” there is speaking of the Father, because Christ is being distinguished from Him in that verse. But headship does not mean Christ is a created being or less God by nature. The same verse says “the head of the woman is the man,” but that does not mean the woman is less human than the man. It is speaking of order, not a lesser nature.
That also fits with Jesus’ earthly submission to the Father. He said, “I came down from heaven, not to do mine own will, but the will of him that sent me” John 6:38. That shows distinction and submission in His mission, but it does not deny His deity.
So I would say it this way: the Father is God, the Son is God, and the Holy Ghost is God, yet they are not the same Person. The Father is not the Son, the Son is not the Spirit, and the Spirit is not the Father. But there is one God. Scripture gives us that truth, even if our minds cannot fully explain everything about it.
The mistake would be to make the Father and Son so distinct that Jesus becomes less than God. Scripture does not allow that. Jesus is the Son of God, sent by the Father, submissive to the Father in His earthly work, and yet He is also “God manifest in the flesh” 1 Timothy 3:16.