As I said, the trinity is a teaching of historic Christianity, historic since several centuries after the Bible was compiled. As for it being Biblical, good luck finding it in the Bible, it is a post biblical belief found in man made creeds. It's source is a mixture early Christian belief and greek metaphysics.
I have already attested to its biblical nature in post #9.
It is evident in the Bible, in the writings of early Christians, AND it was NOTED by the writing of the creeds. It wasn’t created by those creeds.
Using your logic, the fact that no one in the bible mentioned Jesus’ visit to the Americas means that it did not happen, and that, therefore, your faith is false.
Douay-Rheims Bible
“Going therefore, teach ye all nations; baptizing them in the name of the Father, and of the Son, and of the Holy Ghost.” (Matthew 28:19)