I try diffficult to explain how God the Son offered His life, no one took it from Him, still Peter say “You killed the author of life”. So could I say, to make it clearer, that God offered His life, but the intention of men was to kill Him, and when the time had come, Jesus allowed to be killled and so He freely gave His life?
Do you see why it may be confusing? It seems like if We say we killled God, Jesus can’t offer it freely, and if we say Jesus offered it, that it was a sacrifice, but no guilt resulted from the killing.
How would you explain the sacrifice had to be in the fashion of the old Covenant (we sinners had to killl the animal), still in the case of Jesus, he decides when to die, but at the hand of others, and this fact, being killled doesn’t alter the freedom of His sacrifice?