Was God referring to the Holy Trinity in creation when He said these words "Let us make ", the us refers to the Son and the Holy Ghost? If that is the case then the doctrine holds but scholars shouldn't dig too much into the doctrine, it could cause confusions.
In a word, "Yes." You may ask, "How do I know?" It says at Genesis 1:1, "In the beginning God created the heavens and the earth. I want you to notice something. At vs3, "Then God said." At vs 4, "And God saw etc." At vs5, "And God called the light day etc." At vs6, "And God said etc." At vs7, And God made the expanse etc. Vs8, And God called etc. Vs9, And God said etc."
Notice I did not include Genesis 1:2, why? It says, "And the earth was formless and void, and darkness was over the surface of the deep, and the Spirit of God, was moving over the surface of the waters." Here we are introduced to God the Holy Spirit. Tell me why vs2 did not just say, "and God was moving over the surface of the waters." You have two persons identified here.
So what about Jesus Christ, the Son of God? Where does He fit in to the "Us" at Genesis 1:26? John 1 in the New Testament has the answer. At John 1:1 it says, "In the beginning was the Word/Logos, and the Word was with God, and the Word was God." John 1:2-3, "He was in the beginning with God." Vs3, "ALL things came into being by Him, and apart (or without Him) NOTHING came into being that has come into being."
So what's the point? Both Genesis 1:1 and John 1:1 start out with the same three words. Now watch this Timothy! The main thought of "In the beginning" at Genesis 1:1 is on WHAT HAPPENED "in the beginning." And the main thought of "in the beginning" at John 1:1 is WHO EXISTED "in the beginning.
So the reality is the fact that John's beginning "antecedes" the Genesis "beginning." Or to put it another way, Jesus Christ pre-existed His incarnation. Does that make sense to you? One more thing I want to address. You stated if Jesus is God how come He did not know the day and hour of His coming?
Please read Philippians 2:5-8. This is where Jesus Christ, who was always God took on another form of that of a bond-servant/man. As a man He was fully was committed to His Father in every single area of His life, just like we are suppose to live in harmony with God. Jesus was our example which Philippians 2:5 states. "Have this attitude in yourselves which was also in Christ Jesus." So again, does this make sense to you?
IN GOD THE SON,
bluto