As Christians we are supposed to be different from the world. There's nothing wrong with the stuff as long as people don't let the accumulation of the stuff get in the way of doing what the Bible says to do.
Number one thing the Bible says to do: Preach the gospel. Tell Rick Warren he needs to preach the whole counsel of God. Preach the whole Truth, because a half truth is still a whole lie. When he is doing that, then his good works will matter. Until he sets that straight, the rest means nothing.