to kill or not to kill?

After discussing about Abraham and Issac, their story about God tempting Abraham to kill his son, it left me with some thoughts. I believe in God and everything he does, however I never came to the conclusion he would actually have a father take the life of a child. I know He does everything for a reason but what was the justification for this. I believe God works in slow strange ways. I believe God was testing Abraham's faith, seeing if he trusted God's decision. However I don't understand why God wanted him to kill his son. Issac realizes how crazy he is and leaves the country. I think Issac did not have faith in God because he abandoned his own dad, instead of trusting what he father was doing. I do not believe in taking the life of someone and if God were to put me in this place i do not think i could even come close to taking the life of another. If you were willing to kill your own son, your loyalty to God is undeniable. There is nothing more you can ask for, God was not planning on killing Issac, he was just testing his faith.