I deliberately left out weddings, funerals and occasions like that since they sorta break the norm.
I'm genuinely interested, since I read this http://religionvirus.blogspot.com/2010/12/is-christianity-dying-american.html which says:
"According to a new University of Michigan study, American church attendance runs around 35% to 45% if you simply ask people. But if you actually check on their church attendance, the truth is that only 26% of Americans attend church regularly. That's a HUGE difference."
I know we're mostly a atheistic, liberal bunch, but still, it would be nice with some numbers on it.