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Atheism is defined as the lack of belief in the existence of a God or gods. Despite its history and cultural roots as a Christian nation there's little doubt that over the years the U.S. has become home to a growing number of non believers. Some of the most powerful and well known atheists in America include David Silverman (former President of the American Atheists group), author Philip Roth, and writer/neuroscientist Sam Harris (who has been dubbed as one of the "Four Horsemen of Atheism").