Sorry but your reasoning is somewhat shallow. Abraham may not even been aware he was speaking prophetically about Christ coming but at that troubling moment he was seeking to bringing temporary comfort to his son. I do believe it was a prophetic statement however. Let's bring up those couple of verses from Gen 22:7,8 and then I'll close by asking a question,
So Abraham took the wood of the burnt offering and laid it on Isaac his son; and he took the fire in his hand, and a knife, and the two of them went together. 7But Isaac spoke to Abraham his father and said, “My father!”And he said, “Here I am, my son.”Then he said, “Look, the fire and the wood, but where is the lamb for a burnt offering8And Abraham said, “My son, God will provide for Himself the lamb for a burnt offering.” So the two of them went together. Gen 22:7.8
So my question. You really feel you can take from that, Abraham knew, understood and comprehended all things which Jesus would come some day to do because of that statement he made above? I'd say that would be a stretch to say that.
1. The Gospel was preached to Abraham. There is only one Gospel.
Gal 3:8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.
2. Abraham received the sign of circumcision that indicated in his flesh a sign of an inward change.
Rom 4:11 And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:
3. Abraham foresaw the death of Christ in his own son Isaac.
Isaac was offered upon Mount Moriah. The very place called "Gordon's Calvary". The very spot where the solder's slide his cross into the ground.
I personally believe that Abraham literally foresaw the appointed death of Jesus Christ and the resurrection.
Heb 11:19 Accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure.
I also believe that this is very spot from which God took the very dust/ashes of the earthy to form Adam.
4. The bride of Christ can be seen in the wife of Isaac. A foretelling of the Spirit of God's work through Eliezer. The Servant of Abraham. The subservient heir of Abraham seeking a wife for Isaac. Abraham sent Eliezer out to find Rebekah.
Gen 24:2 And Abraham said unto his eldest servant of his house, that ruled over all that he had, Put, I pray thee, thy hand under my thigh:
Gen 24:3 And I will make thee swear by the LORD, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell:
Abraham literally lived the Gospel.