User blog comment:John Breasly/Robert Mc Roberts, The World Does Not Revolve Around You/@comment-3300047-20120611031809/@comment-3112181-20120611194524

You're right, there are about 1.1 billion atheists. And if you noticed, I said both Catholicism and Islam both have about 1.6 billion followers, so they are about equal. To be more precise, Islam has an estimate of 1.57 billion.