The story of Abraham sacrificing Isaac is perhaps also understood as Abraham acting in harmony with the tradition of human sacrifice in his time, and God putting an end to such a practice. Once and for all. And it never appeared in Jewish history, the reason being this story. Your suggestion that not only did God provide the lamb, but in terms of sacrifice the Divine sacrifice upends the animal sacrifices, too. It is a way of understand, but we do well to keep in mind Paul's sense that we do not know the half of reality, and when the complete comes, we will not know the rest of what we don't know, but we will discard everything we now know as irrelevant. (1 Cor 13)
