Well if someone came to you saying they were going to sacrifice one of thier children to God because God spoke to them telling them to do so what would you conclude? Would you tell him to be faithfull to the voice and do it so they can become God's friend like abraham was?
http://www.voiceofdharma.org/books/pp/ch2.htm
At any rate, Abraham does not behave like a man who, after years of fruitless trying, has been blessed with two sons. He sends the eldest, Ismael, together with his mother Hagar, away into the desert. The youngest, Isaac, will be sacrificed at Yahweh’s command. Did Abraham suffer at the thought that these children, who had restored his manhood in the eyes of his tribesmen, were in fact not his children at all? Did he suffer from a conflict between his delusion of a God-given promise of numerous progeny, of which the sons were the fulfillment, and the sneaking realization that they were not his own sons? At any rate, in a completely pathological development, he hears a voice telling him to sacrifice his son.
This is one of the great religious founding moments of the Judeo-Christian tradition: Abraham obeying Yahweh all the way, even past the limits of absurdity. But in the Bible narrative (Genesis 22:1-19), this great and profound act is conducted without any religious pomp, even secretively. He doesn’t tell his family he is going to obey Yahweh’s glorious command. He makes his son believe they are going for an ordinary animal slaughter, until Isaac himself notices that they have everything for a proper slaughter except an animal. He expressly tells his servants that he and his son will both come back soon. He knows his family will prevent him from obeying Yahweh’s command, and rightly so.
The narrative goes on to relate that Abraham is prevented from striking and killing his son. it says that an angel of the Lord intervened. If we discount the hypothesis that angels exist and intervene in human actions, we simply read that someone stopped him. Perhaps the voice (“Yahweh”) has changed its mind, and now tells him not to go all the way. It tells him that he has already passed the test of obedience, and resumes the older tune that he will be the ancestor of a numerous people. But more probably, it is the people in his surroundings who stop him, and the explanation that they have really been Yahwah’s agents ripens later in Abraham’s brain.