What's the deal with Atheists?

If you don't believe God exists why can't you leave it at that? I don't believe in Santa clause and I don't waste my time on forums arguing his exisitence. What drives you to spend so much of your time arguing about nothing? You all just seem very foolish to me. Most of you seem intelligent have you nothing better to do than argue with believers? Believers believe God exists and it becomes their religion. You don't believe. So why when you denounce the evils of religion do you go and create a religion out of anti religion. All of you athiests that actively post on R&S are as bad or worst then the believers because you spend your time arguing about the exsistence of nothing!