An article I read (found here) speaks of Evangelical churches growing in attendance numbers in Sunday worship during times of economic downturns while mainline churches attendance continues to fall (albeit a bit slower than in "normal" times).
The study was done by a professor at Texas University and tracks some of the historical trends of economic downturns and church attendance.
Of the many questions I have one that I continue to come back to is:
Is there anything the mainline church can do to stop the dramatic decline of members?