Sympathy for the Devil

I had an interesting experience this afternoon. I had the radio tuned to NPR and they were discussing the deaths that occurred due to a stampede during the Muslim pilgrimage to Mecca. In explaining the background of the ritual "stoning of the devil," the commentator explained that in the Muslim account of God's commanding Abraham to sacrifice his son Isaac, Satan appears as Abraham is leading Isaac to the site of the sacrifice. Satan says basically "What kind of God would command his servant (i.e. Abraham) to sacrifice his only son?" Abraham then throws stones at Satan to drive him away and proceeds to sacrifice Isaac who is saved at the last minute when God miraculously provides a ram to be sacrificed in Isaac's place.

The part that really caught my attention was that I said (word for word) "What kind of God would command his servant to sacrifice his only son?" in a discussion a few months ago. What does it mean that I'm saying the same thing that Satan is reported to say? Maybe the believers who see secular humanists as tools of Satan are right.

Or, more seriously, what does it mean that I think Satan has a good point? What kind of God would test a believer's faith by commanding him to do something something that pointless and evil? Also, why is it considered to be a good thing that Abraham was willing to kill his own son just because God said so? Shouldn't he do what is right rather than being willing to murder an innocent just because he is ordered to? What would have happened if Abraham had said "No, it is wrong to shed innocent blood. I won't do it."?