People who write about the current religious scene in the USA are quick to comment on the rise of the “Nones” (people with no religious affiliation), the decline of the mainline church (steep), and the decline of Christianity in America in general (not as steep but noticeable.) I think the rise of the “nones” is not much of a story — people no longer go to church because its the thing to do — we’ve known this for a long time. These people are not necessarily — or even likely to be — atheists or secularists. They are that demographic that used to attend church — or identify with a church while rarely attending — who now don’t.
It’s not a crisis when people don’t come to church. It’s a crisis when the church stops spreading the Gospel of Christ. The Great Commission was never: “let people come to you.” It was: “go into all the world and make disciples.”
The more evangelical (its hard thing to measure precisely) segment of the church seems to be holding its own — maybe. (I personally wonder how much evangelical and conservative decline might be related to the resurgence of hard line Calvinism — but, again, that would be hard to measure.)