If I remember correctly it was Jehovah who told Abraham to kill Isaac to see how faithful Abraham was.
Yep...so you hear this voice in your head...I am almighty god. Bump off your son and I will be pleased with you. The first thing I would ask for would be photo ID to prove it. At the very least a bolt of lightning ( close but not too close to prove his point)
Think about how many people over the years have claimed to hear god talking to them and have killed IN THE NAME OF GOD.
If god really wants me to kill for him or needs me to kill for him then my standards are higher than god's. I don't need, want or worship this kind of petty god.