[Salvation]

Beg to differ. Read the beginning of Genesis very carefully. You will find the Trinity there. The wind (Holy Spirit) the Word (the Son) and God the Father.

Why does God say "Let US make man in our own image."? The Triune God was already present?

[SubMareener]

Not sure why you think you disagree with me. I said the Trinity is not a mystery because it is found in the Old Testament. Elohim is the name of the triune Godhead in Genesis.