What are you on about? There are many Christians who have no problem with LGBTQ+, and there are lots of relevant issues about it to discuss, especially in a Christian community.
Then I think you've fundamentally misunderstood. If I have a community about baseball, and I don't allow non-baseball content, I would not have a rule stating "no non-baseball content and no LGBT content". That doesn't make any sense, and would only be included if I also wanted to remove baseball-and-lgbt content, which would be bigoted.