@lozerfac3
God is a just God. He demands that the wages of sin be paid for.
This is really well put. It's concise and clear. When we think about justice for wrongdoing, we think about making some sort of recompense--that is, the just thing to do when having failed some moral duty is to somehow makeup for it. In this case, humanity has sinned against God and so we must make some kind of compensation. I'm totally with you.
But once I take a step back, I get hung up again. Here's why. When one demands some sacrifice--whether it's an apology, some kind of compensation (e.g. money), or quite literally a sacrifice--the implication is that fulfilling that demand is possible. If you insult me and I demand an apology, there's an implication that you're actually able to apologize. If you're dead or unable to communicate, my demand doesn't really make sense. If I'm demanding you pay me some ridiculous amount of money--like a trillion dollars--then my demand is, again, nonsensical.
This leads me to the following thought:
A just sacrifice is one that the agent is able to make.
Note, this isn't a definition or analysis of 'just sacrifice'. What I have in mind is merely a necessary condition. If you prefer the logic form:
If X is a just sacrifice for S, then it must be possible for S to sacrifice X.
That's all the argument I can really give for the above principle right now. I feel like it's pretty intuitive; but I may be missing something. At any rate, I bet you can guess where this is going by now.
God is demanding that a sacrifice be made to atone for our sin. But he also demands that a morally perfect human be sacrificed. Since original sin would have metaphysically tainted humans, even a sacrificial baby wouldn't have worked. Instead, God must make a corporeal version of himself that is untainted in the relevant sense in order for this sacrifice to work.
Thus, God's demand is unjust. He's demanding something--namely a morally perfect sacrifice--that no human would be able to make. That's precisely why he had to intervene in order to fulfill the sacrifice. This is a pretty clear violation of (what I take to be) an obvious condition on what is a just demand.
And, as the others have pointed out, God could have simply forgiven mankind. Why, for example, was the murder of everyone and everything on the planet--save for Noah and his immediate family--not sacrifice enough? And why can't an omnipotent, all-loving being simply forgive humanity without having to go through all this? It just seems needlessly complicated.
This is yet another bit of evidence that, for me, points to the Bible being just another book of mythological tales. Think about the parallels between Abraham being commanded to kill his first born son (Isaac) and then Mary's first born child being sacrificed. You can even see early forms of literary foreshadowing and the development of motifs with the Cain and Abel story. Cain, of course, is the first actually-born human (since Adam and Eve weren't technically born) and his pride and overall 'impurity' led him to kill his own brother.
I'm also curious as to why God forgiving humanity's original sin in the absence of a human sacrifice would affect our free will in any way. The end result is forgiveness either way, so how does a human sacrifice preserve free will while a standard forgiveness doesn't?