While holy wars rage in far too many corners of the world, British atheists are launching a fiery campaign of their own, albeit of a totally different kind. Starting today, the first national atheist "advert" campaign rolls out-literally-all over the United Kingdom. The message? "There's Probably No God. Now Stop Worrying and Enjoy Life." The British Humanist Society has bought space on 800 busses, 1,000 poster ads in subways and two massive video screens on London's Oxford Street to bring attention to their godless message. It's stunty, and certainly lots of people will think it's kind of funny, but why did they do it?Last year, a Christian campaign bought space on the sides of U.K. buses with an URL that linked to a site saying nonbelievers would burn in hell. After a comedian cracked a joke about an atheist counterattack, the BHS started raising money. Flooded with donations, they quickly bought the ad space, inspiring similar bus-sloganeering stateside, in D.C.For a cool-looking Google map of where the atheist buses will be rolling, click here. Einstein would be proud.