For a variety of reasons, all of which can be grouped together under the heading of "being a normal and well-adjusted moral individual" I find all of these explanations, all of which seek to justify the proposed human sacrifice as moral, to be complete and utter bullshit. Or, as Julia sweeney puts it:
This Old Testament God makes the grizzliest test to peoples' loyalty, like when he asks Abraham to murder his son Isaac. As a kid we were taught to admire it. I caught my breath reading it. We were taught to admire it! What kind of sadistic test of loyalty is that, to ask someone to kill his or her own child? And isn't the proper answer no?
I have however come across two bits o' media that cover the story in a way that at least shows some sort of attempt to understand it. The first is from Radiolab, and is sympathetic to Abraham. Listen here.
The other is satirical and very unsympathetic not only to Abraham but to the world view that holds that this sort of sadistic test of loyalty (to quote Sweeney) is justifiable: