I wouldn't like to paraphrase the words of John Piper about people who are using the gospel to promote the prosperity. But, as a Brazilian and with some life experience in visiting different Churches and different denominations, I understand how dangerous this approach is for the ones who are in need of everything. I mean, basic food and supply to live with dignity.
I wish you can watch this video:
http://www.youtube.com/watch?v=ukcV-xtU3hc&feature=related