"Coming out" is a means of empowerment.
MORE: http://www.psychologytoday.com/blog/our-humanity-naturally/201204/why-more-nonbelievers-are-openly-identifying
See also...
Atheists: A misunderstood minority
http://www.northern-iowan.org/opinion/atheists-a-misunderstood-minority-1.2732482
New Atheism values intellectual honesty
http://www.centralfloridafuture.com/opinion/new-atheism-values-intellectual-honesty-1.2731589
Poll: Do You Believe in God?
http://www.lifeslittlemysteries.com/2364-god.html