Really, why are they? And they are! I noticed that!
Well, if you really want to know, you can now read Greta Christina’s book on the topic, Why Are You Atheists So Angry? 99 Thing That Piss Off the Godless
It just came out, moments ago, in Kindle form. I believe it will be out in a few other formats over the next several days. Obviously, you can keep an eye on her blog for details.