On the one hand:
The March 2010 Global Atheist Convention (GAC) in Melbourne, Australia from 12th to 14th of March, was a watershed event that lived up to its theme, The Rise of Atheism, in so many ways. Over 2,500 people attended this largest, priceless gathering of freethinkers to hear from more than 25 of the world’s most prominent atheists, philosophers, scientists, commentators and comedians.
On the other hand:
According to the International Programs Center, U.S. Census Bureau, the total population of the World, projected to 04/29/11 at 22:40 UTC (EST+5) is