TO GO WITH AFP STORY US-RELIGION-SOCIETY BY RUTH MORRIS A billboard put up by the Florida Atheists and Secular Humanists (FLASH) is seen in Davie, Florida, on August 19, 2009. "There is no God, but ice-cream is great." Atheists groups are springing up all over the United States, challenging the influence of religion in public life with humour and grass-roots activism. AFP PHOTO/Ruth MORRIS (Photo credit should read RUTH MORRIS/AFP/Getty Images)