Below is a link to a good article about market driven churches and how churches have turned away from Biblical truth. It's happened more and more in recent years where those churches have gotten further and further away from God and the Bible. It's also exposes I feel the kind of problems that are concerning about "Purpose-driven churches." I am concerned about John Piper's endorsing Rick Warren in any way, because Warren is all about marketing from what I can see. He has even helped religious groups who aren't Christians by teaching them how to grow their congregations. He praises Mother Teresa and leads people to believe she was a Christian. She was both a Catholic and a universalist...not of the Christian faith that I am.
A Clarion Call to the Modern Church