Yes, it has been repeated, and it continues to be irrelevant each time. The point is that Abraham was willing to murder his own son. Sure, in the end it didn't actually happen, and god didn't really intend for him to do so, but it doesn't change the fact that it was in Abraham's heart and mind. So go ahead and repeat it some more.
Does it really make sense to you that a supreme being would require a pile of dead animals?
If Abraham was truly a righteous man, he would've known that what god had asked of him was evil and unjust, and that the moral coarse of action would be to defy god. That should've been the test. The story would've been a lot more meaningful.
It isn't that God requires a "pile of dead animals". It is the willingness to give up the best of your flock or your harvest (they sacrificed wheat and grains, too)- one you would normally keep to breed- for the love of your God. And the people who sacrificed ate the lamb or the fruits of their harvest- they didn't just kill and burn it up, as some people seem to think.
But this is our beliefs- I really can't explain it to you- I don't think anyone can, unless you actually follow it.
And the story was about defying God or not defying God and trusting God's judgment. If you don't believe in God and/or believe that God is malevolent, is going to see it the way you do- but I totally understand your point of view- even though I don't agree with it (Not totally understand, I couldn't do that unless I was you, but you know what I mean, I hope). I used to be an agnostic and thought the same way.