
Originally Posted by
lesslucid
Of course the answer is nothing. But I think it's not the right question. A better question is, how much do you need to understand about another person's beliefs in order to show that those beliefs are self-contradictory? One of the things that philosophers talk about is the fact that there are several ways that a reasonable person can interpret the same facts. They try to distinguish between what they themselves believe, what they acknowledge as a reasonable or a potentially true belief that they do not hold, and beliefs which are, in themselves, unreasonable. Dawkins and Harris and the like, though, don't engage in this kind of philosophically sophisticated discourse, and it makes it hard (for me at least) to take them very seriously. They treat "religion" as a single homogeneous "thing", and then find some examples of a religious person saying something foolish and treat it as proof positive that the whole "thing" is foolish. For serious and thoughtful people who have given real consideration to their beliefs and their basis, it is naturally quite frustrating to have this treated by the wider culture as a meaningful critique.
Of course, religious people who have thought very much about why they believe what they do are in a minority, but that doesn't change the fact that they are the ones you should be talking to if you want to critique the conceptual basis of religion. Most people who drive cars couldn't tell you much about how the engine works; they just know that it does from experience. If you want to criticise the design, though, the people to talk to are the engineers.
That's not to say that, ultimately, the theologians might not be wrong, that religion in general might not be bunk, that Dawkins et al might not be right. To me it seems the question is very much open. But yes; in short, disbelieve what you like. If you want to tell people to stop believing as they do, you should make a decent effort to understand a bit more about what they believe than just the silliest things you can catch churchgoers saying.