Well JE,
Though it is true both Christians and Jews have the same story, they look at them in extremely different lights. As you have demonstrated.
You see from a Jewish perspective:
1) Abraham lived in a time were it was very common of a god to ask for the first born son to be sacrificed, and so it is assumable that though Abraham might have inwardly known it to be wrong, he was in all likelihood grudging acceptant common practice of the day a hence did not challenge G-d on the matter as was his responsibility(and the reasons G-d ask it of him, was to make a ponit).
2) Abraham and Sara were both well known for their willingness to challenge G-d on issues that they felt were unmoral (a common theme with the family); Abraham in this case said nothing, which shows something was different. This a man who defended sinful people, yet not his own son?
3) The Torah hints at Abraham and Saras marriage being greatly compromised by the events, which show some of the negative connotations of it.
4) The most important fact was that G-d Stopped Abraham from his sacrifice, and hence made a statement to all generation after him, of how unacceptable it was.
5) The torah says outright the practice of sacrificing a child to G-d is the greatest of pagan sin, and in G-d's own word he said he hates such things. The story is put in context of the torah as a whole.
So indeed Jews as well as I see that Abraham actions were wrong in this case, and he should have argued for the life of his son.
We view that he didnt and sufferer the consequences (in his marriage and latter relationship with his son). Our view of the importance of this event are not that actions but the fact that God STOPPED Abraham as actions speaks louder then words.
Does this mean that to believe Jewish view is to nullify Jesus and his connection to this event? Clearly not, as there are many people in this forum that think and act more Jewish then I, and see the connection and no nullification. But those are some of the reasons to why many non-messianic Jews view this event in such different light.
Blessings,
And please keep in mind I cant debate you,
Datsar