Actually, we are learning a lot now from Miss. and Ala. And Churches across the USA can hold a second collection this Sunday for the Archdioceses of N.O. or Mobile or the Diocese of Biloxi. Parishes who know of a particular parish in distress can enter that parish on their prayer lists and look at ways to help them rebuild ...
ping
I was thinking more in terms of water damage than a roof being blown off. Once the water in NO goes down, there will be a lot more that will need to be replaced - plaster, wood, some tile - than anyone can see now. Mold starts and it's awful to try and stop. Kneelers will have to be replaced. Marble should be okay (why don't we do all church floors in marble) and most stone.
Too many floods in this part of the Mississippi River Valley. :)
Actually, NO, once the water goes down, would make a great place for service projects.