I thought that when Jesus cried out "My God, My God, why hast Thou forsaken me", was when God turned his back on Christ because Christ had taken on the sins of the world and God will not condone sin.
I see it as a teaching moment. Read Psalm 22 and imagine Jesus preaching it from the Cross about what He was doing and what was to come... I believe He did that with the breath He had left.
If God turns His back on sinners, then why send His Son at all? He came when we were at our worst. If we believe that God is Love and loves us unconditionally, how can we believe that He would turn His back on us for our sins? We turn our backs to Him when we sin.