Why people don't discuss religion?

The God Delusion by Richard DawkinsI'm currently reading 'The God Delusion' by Richard Dawkins; its a fasinating read.A few things have struck me since reading this book. Firstly that I am more athiest than I thought I was and secondly that, as Dawkins uses science to explain his curiosity with the world, I use some kind of social psychology. In my world, things are not quite as stark as the explanation given by darwinian evolution, but accompanied and driven by human emotion: insecurities, aggression and everything inbetween. But the most worrying thing I have noticed is that society doesn't always openly discuss this stuff. At times I've felt uncomfortable reading Dawkins on the tube - I can almost feel peoples sense of anger and of even debating the god question. Equally, I've had around 5/6 people approach me and ask me what the book is like because they would like to purchase it as well.

We've all heard the phrase, 'never discuss religion or politics' and since reading the book, I have realised there are some people I can talk to, and others I can't. Why shouldn't we discuss these things? I'm as interested in other peoples religion as I am my own brand of athiesm. I find the whole subject facinating. To believe is very human, but we don't all have to subscribe to the same thoery, so surely we can learn from each other? Or am I so very naive?

Having said that...I do find this link very amusing ;)

The Church of the Flying Spaghetti Monster