Seth Godin, marketing guru, has a short article on how word-of-mouth spreads. You can find it here...
He writes, "But if you want the word to spread, if you expect me to take action I've never taken before, it seems to me that you need to do something that hasn't been done before. It might not feel safe, but if you do the safe thing, I guarantee you won't surprise anyone. And if you don't surprise anyone, the word isn't going to spread."
Apply this to the church and the unsaved. When they visit your church, do you think they are surprised (in a good way)? For a majority of churches, I bet they are not.