Churches and those that lead them face a choice: Will they simply defensively maintain what they have (beliefs, forms, practices, members,etc.) or will we boldly press forward into our mission? Stated another way: Will their current identity define their mission or will their mission define their identity? It seems to me that most choose the first option in both questions.
Even if they don't start out that way, I think most churches end up slipping into defense mode. "We have to keep our current membership!" "We can't raise those kinds of questions!" "We've always done it like that!" "That's a slippery slope!" The problem with that is that I don't see where the revolution that Jesus started was ever intended to be a static, unchanging thing that needed us to defend it.
Perhaps we need to figure out how to weave things like revolution and change back into the fabric of what a church is understood to be. Maybe we need to redefine the identity of our churches from the ground up. Admittedly, that's what keeps me in Youth Ministry. Right now, that's the best strategy I can find for redefining our identity. I can only hope and pray that there are others out there who are trying to raise up a new generation of revolutionary disciples who see church as an ever-changing community on a mission. With teenagers (and the unchurched), paradigms don't have to be shifted, they just have to be formed.