Ah, I see. So the question is how it's fair that Adam's original sin gets laid on us? Well, the answer is that sin is like a disease which we all contracted. Unfortunately, it is a disease that warps our free will. And here's the disconnect that I think you're zeroing in on: Christians say God is justified in punishing us for this warped will, or at least the consequences of acting pursuant to that will. I agree that is patently unfair. But, who is the pot to criticize the potter, right? (another morally bankrupt Biblical idea).
So, here is what we're left with: Adam's sin infected us with all with a sin nature. Nothing God can do about that, it's just the way the world works. He is justified, therefore, in punishing all of us, because our very existence is an affront to his holiness. We should be ashamed of even having been born, and if we only knew how awful we are compared to God, we'd send ourselves to hell.
So far so good. God has done nothing wrong, if you accept the idea that the transmission of original sin is something even he cannot contain (I know--you have to work with me here). Therefore the only just thing to do is to send us all to hell. Remember, justice is measured in relation to God, not in relation to us. Justice, as Tony has argued, is an unchanging part of God's nature, existent and complete long before we came on the scene. Therefore justice can only be defined in relation to God (who else, since God's nature was forged in the eternal past when he was the only being around), and that nature demands that any unclean thing be destroyed, and hell is the only divinely sanctioned way to destroy something unclean.
Now wait, you say, that doesn't seem fair! But unfair to whom? It's only unfair to humans. But fairness is not measured by humans, it is measured by God. Therefore it is perfectly fair, because God says it is, because his nature demands that it is, meaning anything he does is fair (since by definition one cannot act contrary to one's nature). Is this a circular argument? You bet. Does it make God's morality arbitrary? Yup (pay attention, Aaron

). But, that's just how it works.
And now that I've tidied it all up, all that's left is for pastor Scott to muddy the waters by injecting human morality into the equation, since whether or not he realizes it, he's actually far more moral than his god

Nobody talks so constantly about God as those who insist that there is no God.
- Heywood Broun