You have not provided any evidence to support that. You have merely assumed that because God mentions three men that that somehow means that God is made up of three persons - but that is not what the Scripture says, and it is totally illogical to draw that conclusion. Peter said, "The God of Abraham, Isaac, and Jacob, the God of our fathers, has glorified his Servant Jesus" (Acts 3:13) - there is just one God, not three, and Peter obviously didn't think Jesus was God if he called him God's servant (Peter knew Jesus was the son of God).
Which is God (Yahweh) speaking to His son Jesus, directing him on what to create next (for "God ... created all things through Jesus Christ" - Ephesians 3:9). Again it is totally illogical to deduce that God is anything other than a single living being from that, or any other, verse.
Genesis focuses on the creation, the flood, Abraham, Isaac, Jacob and Joseph. In what way do the lives of Abraham, Isaac and Jacob tell the story of who God is?
Please explain what you mean by "declaring His name in these three" and how you think that implies God is three persons. God made promises to those three men, and they are the fathers of the nation of Israel. I don't see any implication that God is three persons there.
Definitely no implication that God is three persons there.
You quoted a verse which you had modified by taking words from other verses and inserting them, thereby making it appear that God had said something that He did not.