You guys aren't going to ever understand why Christ said that until you real over Psalm 22 carefully.
Isaiah 45:18-24
For this is what the LORD says – He who created the heavens, He is God; He who fashioned and made the earth, He founded it; He did not create it to be empty, but formed it to be inhabited – He says: “I am the LORD, and there is no other. I have not spoken in secret, from somewhere in a land of darkness; I have not said to Jacob’s descendants, ‘Seek me in vain.’ I, the LORD speak the truth; I declare what is right. Gather together and come; assemble you fugitives from the nations. Ignorant are those who carry about idols of wood, who pray to gods that cannot save. Declare what is to be, present it – let them take counsel together, who foretold this long ago, who declared it from the distant past? Was it not I, the LORD? And there is no God apart from me, a righteous God, and a Savior; there is none but me. Turn to me and be saved, all you ends of the earth; for I am God, and there is no other. By myself I have sworn, my mouth has uttered all integrity a word that will not be revoked: before me every knee will bow; by me every tongue will swear. They will say of me, ‘In the LORD alone are righteousness and strength.’” All who have raged against Him will come to Him and be put to shame.
God would not abandon His Chosen People and speak secretly to some pagan Ishmaelite in some land of darkness.
God is a righteous God, and a Savior. Christ is the Savior and He is God.
I am God and there is no other; I am God and there is none like me. I make known the end from the beginning, from ancient times, what is still to come.
There is no one like Christ is wisdom and perfection, He was good and only God is good.
Also, God tells us that He has a Son in Psalm 2 and 2 Samuel 7.