Respecting the establishment of religion, or prohibiting the free exercise thereof; - 1st Amendment
So... people can gather religiously and pool resources to its own religious ends, and government has to keep its mits off. It's a powerful freedom, one of great value to preserve. As I understand it, churches don't even have to file with the IRS because of this. Most do to provide their contributors with tax exemption info.
Ron Paul has often described how charitable organizations, such as churches, used to meet many of the social needs now used to justify welfare services, healthcare mandate, etc. We should defend any and all rights relating to churches, even if we don't like what many do in the world. Most churches are full of good people.