Imagine you catch a thief in the act of breaking into a car. The thief runs away and you remain guarding the car. When the police arrive, would they not be justified in holding you under suspicion? It would be up to you to prove your innocence.That won't work for one reason in particular: God is meant to be omnipotent, no? The two characters being equated here, the police and the supposedly all-knowing, all seeing, ever just deity, do not possess the same qualities. Given this, we are still left with the image of a vengeful, malicious, short-sighted god.
Original sin is, without a doubt, one of the most repulsive doctrines of Xianity. I have heard it argued by very ordinary, average Christians, that a child born to sinful parents who died at birth or young age would be judged according to its parents' sins and burn, with justification given by the numerous passages in the Old Testament that state that the sins of the fathers are visited upon down to the third and fourth generations. To top it off, I remember once a little debate I had with a lady friend over the morality of God wiping out the entire population of Sodom and Gomorrah. I said that even ascribing to the bigoted view you have ascribed to God that homosexuality is the worst sin imaginable and that the women of Sodom were equally as evil as the men, you simply cannot justify punishing the children as well. Know what she said? The children were evil as well.
And this was a normal, fun loving, otherwise caring and empathetic young woman! She couldn't see beyond the narrow-minded view she had been fed her entire life and see the utter objectionability of what she had just said. This is the same kind of reasoning that causes much emotional suffering and, I believe, permanent scarring to young children who are told that they are essentially evil, and that justifies the abuse and murder of children in Nigeria because they are "witches". This is one of the reasons I am so vehemently against religion and indoctrination.