When God informed of His intention of destroying the wicked inhabitants of Sodom and Gomorrah Abraham made extensive questioning, cross-questioning and bargaining with God till he gets satisfied. (Genesis 18:16-33) However, when God informed of His intention of murdering Abraham’s own only-begotten, innocent son, he simply obeys without any questionings [which he should naturally have done more intensely than he did in the case of unrelated wicked people].
God too acted strangely! No introduction of the subject with sufficient reasons. Straight away, God commands: "Take your son, your only son, Isaac, whom you love, and go to the region of Moriah. Sacrifice him there as a burnt offering on one of the mountains I will tell you about." (Genesis 22:2)
“Early the next morning Abraham got up and saddled his donkey. He took with him two of his servants and his son Isaac. When he had cut enough wood for the burnt offering, he set out for the place God had told him about. (Genesis 22:3)
Obviously, inventors of Jesus’ ransom sacrifice thought for a smooth entry of their incomprehensible subject with a precedence of Abraham’s offering of his son. So they invented story of Abraham’s sacrifice. But this backfires as it poorly depicts God. It gives the impression that God was not sure of the propriety of His idea of offering His son ‘to take away the sins of the world;’ hence He makes a trial as though to find out what its receptiveness could be, through the response of Abraham. This is not warranted in the case of all-wise God which shows this is all human thinking! To provide a basis for Abraham’s story, they had to invent Lot, and destruction of Sodom and Gomorrah—a story with no purpose because Lot’s daughters finally had to ‘get their father to drink wine so that they could lie down with him to have children from him’ (Genesis 19:30-36), children (Moab and Ben-Ammi) who became the ancestors of two nations Moabites andAmmonites that became enemies of Israel.
To produce one incomprehensible story of God offering His son to be murdered as sacrifice for the sins of the world, see how many incomprehensible stories that must precede it!