"No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father." -- John 10:18
Thus it is Christ's perfect, merciful obedience to the commandment of God that saves us.
In that passage Christ agrees with me, not with you: " I lay it down of myself". He received the power as the commandment of the father, not that the sacrifice is a commandment.
I have a feeling it is for the second time I explain that.