Abraham knew that God was in control, and that if He was given a commandment by God, it was the right thing to do. God knew that Abraham wasn't going to kill Isaac. God wouldn't have commanded Abraham to kill Isaac if he knew he wasn't going to be stopped.
I'm not sure what your point is on morality. Morality is created by God, since he made us and all things. If He doesn't have the right to set morality, I'm not sure who does.
Jesus quite often rebuked the religious leaders of his day for rigid and strict obedience to the law without compassion or love for other people God doesn't command us as Christians to be heartless or unkind. Abraham was a special exception and God was in control of the entire situation
If God told you to, should you murder your child?
This is one of the more concerning questions I found while reading the Bible, and what's worse is that the answer is unequivocally "yes". Since when did the murder of innocents become justifiable?
I understand that in the story of Abraham and Isaac, it was all a test and God didn't actually mean for him to go through with it. But what if he had? There would be no doubt that Abraham would have done it. I think that sort of blind obedience is concerning, and quite possibly dangerous. If your morality is what some higher authority tells you it is, you could do anything, and believe yourself to be right.
How do Christians reconcile with this? Obedience seems to be valued more highly than love, or basic morality, or family, or anything else. Is it any wonder the Isrealites were enslaved for 400 years?