2) they really don't give a flying fugue about the matter and they know that the vast majority of their parishioners also really don't care. Those of us who frequent this forum sometimes delude ourselves that this is a really hot topic in the world of discourse. In fact, their are only a few dozen of us - a couple of hundred at most - and that is out of the roughly 200 million people (in the US) who frequent the web.
I suspect that the churches are nervous of approaching the subject. It divides the clergy and congregations, so it's a minefield for them.
As for the internet, there are loads of places where you can find evolution vs. creation being hotly debated. Other boards like this, the comments sections on blogs, and the comments sections on news articles on the subject, for example. We're a tiny (but erudite!) part of it all.
Here's an example. This video by a young unknown went up about 3 weeks ago. It has had 940,000 views, 20,000 ratings, 18,000 text comments, and 115 reply videos.
And books on the subject can hit bestseller lists, as Dawkins' current effort just has. (Although it has to be said that they probably have to be by Dawkins in order to achieve that)!
On Amazon.com, there are special evolution and intelligent design "communities" on which you'd expect the EvC debate to be raging, and it does. But the really telling thing is that the general "science community" is dominated by the EvC debate as well.
So, plenty of people in church congregations will be interested, but what's a preacher to say without offending one faction or another?