Sadly, the largest evangelical church in Jacksonville, Florida has gone greedy: they are now preaching prosperity gospel: you give money to the church, and God will mysteriously and miraculously find ways to give it back to you. Watch the video of Stovall Weems and Robert Morris.
One of the tactics in this gospel is for the preacher to give a testimonial of an unnamed church member who gave money and got a miracle. These are atypical testimonies, and thus even the FTC wouldn't allow this kind of advertising for a product being sold on TV or the Internet.
Shame on these guys, and the people who empower them.