Okay, I can see why you say this. Now, implicit in this is the belief that only this would be an acceptable sacrifice to God.
Would you agree or disagree that God, being sovereign, could choose to accept whatever sort of sacrifice He wanted? That it was up to God to decide what He found acceptable?
Two thoughts. Of course God could have created the universe differently, and then justice would not have required an infinite reparation for an infinite gulf.
Second, and more "progressive," God provides Himself a sacrifice not for His own need to be propitiated, but for our human need to make amends. Since we are made in His image and He is Just, we by nature wish to set things right that we have disturbed. We would not feel that we have made amends without dong restitution. So God provides the way to make restitution.
By necessity, this must be infinite.
SD