I have always believed that while Christ was bearing our sins on the cross, the Father could NOT look upon Him. After Christ declared, “It is finished” and gave up this mortal life, I believe that separation was over. It had to be an almost intolerable moment for both. We can only imagine what TRUE fellowship with the Father is really like, but, yes, I believe God suffered seeing His only Son there on the cross, having been beaten to a pulp (unrecognizable) and then to have to carry the cross up the hill to Golgotha. God has experienced our deepest hurts, as well.
Human sacrifice is utterly abhorrent to G-d. It is a SIN.
Why would He change His mind on the matter?