Here's an interesting article from 2004 where religious leaders were freaking out about church attendance. We were on our with Germany's stats back then, so the take away is that religious people lie about their church attendance. Say it isn't so!
Always be skeptical about polls.
Absolutely. However, this is a poll they conducted because they know their numbers stunningly low. If it was bogus, then they'd show how their numbers are up.
No surprise, really. My community has at LEAST two formerly huge churches whose congregations have diminshed so much that they'll soon be forced to close down & move to smaller buildings.