You're wrong. It means that newborns have sin in them. That's why they don't go to heaven. It's a terrible concept.
What is Sin?
The capacity to do evil. And quoting Augustine does not help in arguing against the Catholic Church, its theology has moved on.
The reason why we can study theology is because we accept that God has not revealed everything to us, and generally speaking, theology is about exploring humanity's relationship with God. Which changes with time and new knowledge. What right have we to do so? We have no idea, its one of those articles of faith that a Catholic must make.
Often it isn't, sometimes it is. Catastrophically so (e.g. World War I, the Wars of the Reformation, the Crusades etc.)
How was the Reformation irrational? It was a war between the nobles and papacy! Nobles who supported Luther's religion which was quite amenable to state interests, and the papacy which was pretty much on logger heads with the nobility. The damn thing was a power struggle, as rational as everyday life.
The Crusades, on the other hand, were to liberate a tourist spot, liberate a political entity from the threat of annexation, and to maintain trade routes through the middle east. Not very different from what is now going on.
We never stated that religion isn't bloody, but we do say that without religion, history would be bloodier still. Who came up with Just War? The Church. Who came up with the idea that humans are equal? The Church. Who came up with the idea that human beings cannot be trusted to their own devices, that they would revert to savagery without society? The Church. Who popularized the idea that the State exists for the people? The Church.
How do you know? At first glance belief in a bearded Jehova might seem harmless, but look at how e.g. stem cell research is being combated by Christians, not to mention the gross violation of human rights in not allowing gays to marry.
Stem cell research is not being opposed, it is the use of embryos in this field of research that is being opposed. Do you think that without that opposition, we wouldn't have the methods that do not involve killing embryos? What basis have we for drawing the line? What right have we to draw the line? Disagree with the Church as much as you like, hell, I do too, but you must give them credit for provoking discussion on how science will affect our notion of what it means to be human, and what inherent rights, if any, do humans have.
Oh, and gays cannot marry in the Church paradigm due to their definition of what a family is. Argue with them on what is a family if you are going to argue on gay marriage. I fail to see how this violates human rights.
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