What does it say about human nature in general, and Americans in particular, that there are such things as atheist churches. For most people this would seem like an oxymoron. I'm sure most people in Britain, the general public, and humanists, would consider it really really weird that Americans have atheist/humanist churches.
There are humanists organisations in Britain, but I'm sure none of them meet on Sunday morning, have 'sermons' 'leaders' and 'sunday schools.' What does it say about how much Americans love going to church, that even those that are entirely atheists, still go to church?
Why is American church-going culture so strong that it survives the complete removal of any metaphysical foundation?
Here's a fun party game: listen to an audio sermon online, and see if you can work out if it's a UU church or an Ethical Society. What does it mean if you can't?
A lot of questions.