Well, in defense of those "angry" atheists, it is easy to understand their anger, if you look at some of the common reasons for it. Religion is seen as superstitious hogwash by most of us. Now, that is no excuse in itself to be angry. However, the Crusades, the Palestinian conflict, the modern Catholic pedophilia issues, Jonestown, the Inquisitions, etc., leave some of us with a bitter taste in our mouths. It is hard to listen to someone saying "Yay, my god is so awesome. I will pray for you and life will be totally great." when the reality of the situation is that many religious beliefs have led to some of the most fucked up situations in the human history of the planet.
I'm not saying that I would approach conversations with any theist with anger. However, I do find it hard not to be pissed that someone could follow such obviously bloody, ignorant, power-hungry religions. For example, when someone says "I'm a Catholic." I often think, "You're either an asshole or you didn't pay attention in history class." That doesn't mean I say it, but I can't blame people who do.
I'm not saying that I would approach conversations with any theist with anger. However, I do find it hard not to be pissed that someone could follow such obviously bloody, ignorant, power-hungry religions. For example, when someone says "I'm a Catholic." I often think, "You're either an asshole or you didn't pay attention in history class." That doesn't mean I say it, but I can't blame people who do.