If Christianity makes you try to do good, help the weak, feed the hungry, be compassionate etcetera, embrace it with all your heart.
If Christianity makes you scared of change, narrow-viewed and judgemental, run the F away.
Now as to the original post's question, I'll try to give my view if it's of any comfort:
If the God of Christianity is truly as loving and benevolent as they say, he couldn't care less if t-girls do what they do. They don't hurt anyone with it, and it makes them happier, and it's much easier to make other people happy when you are happy yourself.
If the God of Christianity is not as loving and benevolent as they say and gets upset about t-girls living their life... it's time to go shopping for a better God.
's My take on it. ^_^
Kimmy