If you really want to meet gay Christians, you'll have to go to them. They're not likely to come to your church and proclaim themselves. Even if they are totally out, it's not the sort of thing that comes up in day to day conversations. If there's a gay affirming church in your area, you might visit some day and see what they teach. It's not so different from any other church. I don't think we can resolve that for anybody but ourselves. Those that I've known either believed same sex behavior was sin or were undecided on the issue and resolved not to act on it unless they were.