As aforementioned, people don't wanna just go into a room full of people and just stare at each other and think.
Are you familiar with Quakers?
As aforementioned, people don't wanna just go into a room full of people and just stare at each other and think.
Usually, the reason why the Quakers were popular was because if you were not Quaker in a Quaker community you usually had things go bad with you fast.
"But nobody has no practices"? Depends on how you define practices, obviously.
The American Revolution goes way more radical and creates its own Cult of Reason style revolutionary religion?"The World is my country, all mankind are my brethren, and to do good is my religion." -- Thomas Paine
Maybe we can use this for something?
From what I've read about these organizations, their purpose seems to be to give non-believers the social experience that going to church every sunday gives to believers. They aren't people who are "united in that they don't believe in one particular thing" they are united in the belief that a weekly meeting in a church-like environment makes them feel good and they don't want to give this up just because they are Atheists.