Church volunteers are great to have for volunteer work after a tornado – unless of course they have to audacity to wear those dreaded Christian tee-shirts.  In that case, a FEMA videographer will ask you to remove the offensive clothing.  The FEMA brass of course did the obligatory mea culpa after the damage was done.  Would FEMA ask muslim volunteers to remove their headscarves?

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof…

First Amendment, United States Constitution