You're playing word games, Kosta. Whether God demanded or desired is not the issue. It is a false dichotomy for there is no distinction since God did both the demanding and the fulfilling of the demand (showing his desire to do so). No, it wasn't an obligation to do what he did but saying he demanded a sacrifice in no way obligates God to BE that sacrifice. The demand was that the price be paid. We could have paid the price ourselves, but that would mean eternity in Hell and no reconcilation with God. This was not what God desired. God desired a reconciliation with us but His justice demanded that the price for our sins be paid. God's justice was satisfied by the penal substitutionary atonement of His Son as well as His desire to be reconciled to man.
Amen. All as ordained by God from before the foundation of the world in order to bring glory to His name.
Q. 1. What is the chief end of man? A. Man’s chief end is to glorify God, and to enjoy him forever.Westerminter Shorter Catechism:
"For of him, and through him, and to him, are all things: to whom be glory for ever. Amen." -- Romans 11:36
No demand. You object to "mother of God" because some illiterate Christians might think Mary preexisted God, but you insist on the attribute of God that grossly distorts His image.