My husband has been going to meetings everyday for almost a year now. I have not heard one word about his meetings or the people he meets there and I never ask, nor do I have a desire to know. When he leaves, I get a kiss, he tells me & the kids he's going to a meeting and he'll see us later. That's it!
Same goes with the Al Anon meetings I go to. I see people from meetings all over town, at softball games, soccer practice, school functions, the supermarket etc. It's not a big deal. Life goes on the same as before, hopefully healthier for you. You can't run away from it, instead be amazed at how many alcoholics and enablers there are out there ........ there is probably a lot more than just that one you saw at church. So what if someone knows he's an alcoholic ..... he is and it's a truth he and you have to face with dignity if you can. It's a disease, one that both of you are trying to overcome.
I don't even think you should have to tell your husband you're going to a meeting. Just go!