That entirely depends on what you consider Christian. If you are going to follow a particular denomination or set of teachings then you need to follow it all. If it has a list of do's and dont's, you don't get to choose which ones to follow. If you are going to follow a religion, follow it completely. This is one of my pet peeves. Nothing gets my knickers in a knot more than someone claiming to believe in the Bible but conveniently forget to love everyone and to not be judgemental of others.
Now, there are Christian churches who believe almost anything. So, if you are a member of one that allows for a gay or lesbian lifestyle, there is no problem with it. I wouldn't try to say that you are a gay, Catholic witch. That would be a bit of a stretch.
Personally, I think Christanity is one of the most magical and most loving religions there is. Unfortunately, man had changed it to suit his own interest. If you look at the religion according to what it says is correct, not just what you hear at the church on the corner, there is no hatred or condimnation of others. That's man's influence. And sheeple want to follow a leader rather than think for themselves.
In the end, the only thing that matters is that you have the connection to that higher power, no matter what word you use to describe it, and that you follow that higher power. (If that is what you believe, I guess.)
As always, just my humble opinion.