Rich you said...
It was invisible to Abraham for all intents and purposes. You act as if Abraham knew, when Ishmael was circumcised, that God intended to cut Him off eternally. You act as if Abraham understood that this sign was intended to be bifurcated. I completely disagree.
I will also say that the sign didn't signify the same thing for Ishmael that it did for Isaac. And I do think Abraham understood this especially after Genesis 17:21
which was before he circumcised Ishmael as you seem to not understand.
(Gen 17:18) And Abraham said unto God, O that Ishmael might live before thee!
(Gen 17:19) And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
(Gen 17:20) And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.
(Gen 17:21) But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
(Gen 17:22) And he left off talking with him, and God went up from Abraham.
(Gen 17:23) And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham's house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.
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