Former deacon chair here at a Southern Baptist Church. I'm pretty sure we will be opting in and I'm pretty sure I'm going to be asked to review whatever policy is implemented. We have a pretty good handful of LEOs in our congregation who would be expected to be the point men for reaction should any threat ever arise. They sometimes carry anyways so it will not be anything new to our church.
I would suggest you point out that responsible men have carried concealed in the past and no problem has arisen due to members carrying concealed. Having the church opt in would serve to keep these responsible men from being branded as criminals should the rare event occur that one of them saved someone else's life.
I really don't think the church needs to get into the business of deciding who can carry and who cannot. Why take on that liability?
Just ask them to opt in and adopt a church policy that broadly provides: "Adult members are permitted to reasonably bear arms for the purpose of defense but not offense, within the bounds of good judgment and Georgia law."
Since some are hesitant, you might even have them consider limiting to concealed carry only.
Also point out that most people will notice no change whatsoever.
Remind them if it causes a problem, the policy can always be changed in the future.
Just my 2 cents. Good luck and report back what happens.