In the last seven years the percentage of Americans who identify as atheists has increases 500%.
http://slatest.slate.com/posts/2012...1_in_20_americans_say_they_are_atheists_.html
After this sharp rise American now has the same percentage of professed atheists as Saudi Arabia.
http://slatest.slate.com/posts/2012...1_in_20_americans_say_they_are_atheists_.html
After this sharp rise American now has the same percentage of professed atheists as Saudi Arabia.