I am not sure why but people are not attending masonic functions,AmVets & VFW are closing , K of C and ever the Boy and Girl scouts.Some blame the new social media but I am not sure I agree. People still seek to visit with each other and just try to get into a restaurant even during the week. I think people are just changing how they spend their time. As for churches many do not go to a church and profess nothing regarding religion. They just don't give it any thought what so ever.
I could be wrong, but l think it's just a lack of desire to join a group to support not believing in something... it's just a silly notion to many. The older, more settled Atheist feels it's a waste of time..