I personally believe that it is not God's character to ask for a human sacrifice, that this was not meant to test Abraham but a chance, for God to reveal who He really is....Well, actually, no. Animal sacrifice replaced human sacrifice. Judaism specifically rejects pagan human sacrifices, like the child sacrifices to Ba'al. I think that the episode where Abraham is instructed to sacrifice Isaac and doesn't have to go through with it marks the end of the period of human sacrifice to gain closeness with the gods. After that, it becomes a communal meal with God. In order to have a meal, of meat, in the ancient world, an animal is going to die.
The old testament God and the new testament God are the same....a loving God.