They were all in disbelief, but have given up trying to argue with me and just accepted it. Only a few close friends know. I live in Georgia, the bible belt of the south, so I do not broadcast it, only to the bible thumpers that knock at my door trying to recruit me to attend their churches.

If the subject comes up, it comes up. Though if you're officiating a wedding, you probably shouldn't make a big announcement beforehand.

I imagine that would go rather poorly.

I haven't come out except to a couple people close to me.

The concept of god is irrelevant in my life, therefore I see no need to proclaim my non-belief. When the topic of religion comes up, I mostly smile and nod.

speak to me anymore. My close friends know I'm not a very religious person, but not that I'm an atheist.

I don't really think of myself as an atheist though. I am more or less, about a 7 on at scale of 1-10 on a disbelief scale. I don't believe that any religion on earth has a clue as to what god would actually be like if a god did exist or if even several did/do. So anyway, it rarely comes up in a casual conversation and when Xians spout their nonsense I just smile and nod and/or change the subject.

the OP doesn't get destroyed by the conflict of the two extremes. I am an agnostic in a deeply religious family. I don't attempt to convince anyone in my family that I am something that I am not.

To perform at my sister's wedding. It's not my profession.

you and do the things that make you happy. If your wife knows and she loves and accept you, then you are in good shape. If you don't believe in God, don't keep putting yourself up as a representative of God. Be true to yourself. You don't have to become an aggressive Atheist, just go about living the life that makes you whole internally. If someone can't accept your decision, that is their problem.