Guntalk (that's Tom, right?),
Yes, any wedding in a church would definitely be off limits to carry. If the wedding reception was on church property, that would definitely be off limits too.
Also, as you probably know, Georgia has a very vague ban on carrying at a "public gathering". Nobody in Georgia, including the Attorney General and the courts, seems to have any idea what exactly is and is not a public gathering. The Attorney General has released some "unofficial" statements about what might or might not be a public gathering, but this does little to clarify the question.
It is conceivable that local police officers would interpret a wedding reception as a public gathering. Whether or not that charge would later stand is unknown, but it would sure ruin the wedding reception for someone to get busted, even if they were later absolved. I think you could argue in court that a wedding reception is private and not public, but it would be hard to convince the police at the scene of that, especially if it was held at a facility otherwise open to the public such as a meeting hall or hotel ball room.
Police are not well informed on this issue. About 6 months ago, a man was arrested for carrying into a Wal Mart store, on the grounds that Wal Mart was a public gathering. I believe he was later absolved of any crime. Gun show organizers in Georgia also use the "public gathering" clause to prohibit carry.
The bottom line is, the local police will have a lot of say in deciding what they think is and is not a public gathering, and while they may later have to reverse their opinion, the vagueness of the law has a chilling effect on carry at public events in Georgia.