well in the bible god told moses to sacrifice is only son and he obayed! but now you were asked to sacrifice you child! i bet you wont .. no one think of doing that! because you can or would be punished!
No parents in their good minds will ever kill their children. Killing someone is a mortal sin. It is against the law of God and the law of man. If I will kill my children, I am sure I will go to hell and I will be sentenced a lifetime imprisonment or even a death sentence.