Here is a good link to an article in the Philanthropy Chronicle. It shows that foundations and private companies donated over one billion dollars to the people and organizations after Katrina. It is an illustration of how generous Americans are to help people out.
I am sure the unreported money donated in services, gifts and private assistance would be even more than that given officially. Tens of thousands of men, women and young people have spent days and weeks on the Gulf Coast working with people to fix their homes, volunteer at schools and soup kitchens and do a million other helpful things for people. And, most were Christians.
Bust loads of Believers from all over the USA have trooped down to the Gulf to help in any way they can. PTL!! for kindness.