I've got no particular love for the Catholics, but why does GSA even need the Catholic church or it's approval? If the Catholics want to boot GSA and not host GSA events and activities, that is their prerogative. Just as I might choose not to buy girl scout cookies, the reasoning behind a diocese severing ties with GSA is irrelevant. If they want to believe something and be wrong (gee, it's not like THAT'S never happened before), let them. Take your meetings and functions somewhere else and move on. Just be sure to remember their attitude when the offering plate comes around.