If God asked you to sacrifice/kill your son to prove your love for Him. Would you do it?
The entity who is asking me to kill my son would have to first prove he is God, and would have to explain why I would have to slay my child. For example... this being would have to show me the future and show me what will happen if my son is not killed. If this being does prove it, and if this being show's me a proper reason for why my son would have to die.. then so be it. I cannot kill unless my life or other lives are threatened, so this being would have to be very convincing.
It certainly would have to be more than a big booming voice telling me to do it. IF that were to occour, I would head to mental health services and tell them what is happening to me.