Abraham tries to sacrifice his son. Is exploiting a human a moral behaviour?

The story of Abraham is talking about a man, who is punished by God to victimize his son, to prove his faith ([Gen 22:1–19](http://www.biblegateway.com/passage/?search=Gen%2022:1%E2%80%9319&version=NIV)) . Abraham decides to follow his God by killing his own son. But at the last moment, God says 'Stop', and accepts an animal as sacrifice. Blind obedience seems to be the main value, taught by this story. Do, what the authorities tell you! However, this is totally against our modern ethics: Killing a person, just to prove something, is considered evil. Now the victimization did not actually take place in the story, but Abraham is praised for doint, what he was told. So does blindly following God justify everything? You could say that this is just a Jewish story, from the Old Testament, but the story is repeated later, whith different roles: God is victimizing his own son, Jesus, to prove his faith in man. For the parallels, see: [Mark 1:11](http://www.biblegateway.com/passage/?search=Mark%201:11&version=NIV) , [Romans 8:23](http://www.biblegateway.com/passage/?search=Romans%208:23&version=NIV) , and [John 3:16](http://www.biblegateway.com/passage/?search=John%203:16&version=NIV) . But how can the sacrificing of a human be considered a moral behavior? I was taught that instrumenting a person, using somebody like a thing, exploiting somebody is the root of all evil. Do moral laws that apply to humans not apply to God (even though he created man after his own image)? Did he create moral laws for humans that he does not uphold? The main question is, as stated in the headline: Is it moral to sacrifice your son in order to grant favor with God?