Gina,
I am a transgender Christian. I to struggled with this issue as a Christian before accepting who I was. I have researched this as a theological issue. It is an interesting subject and one that the church has to deal with. I do not consider myself liberal in fact evangelical.
Anyway he's what I have found. Deuteronomy 22 verse 5, seems to say that it is wrong to crossdress and that God detests anyone who does. However that must be seen in the context of the verse. It seems that this is early on in God's progressive revelation and may be more to do with bad practice in ritual temple prostitution. So God's people should not do this as a means of idolatry. I hope I am explaining it OK.
There is silence after this for hundreds of years until the New Testament. Which again suggests it being forbidden because of the temple prostitution and gaining access to the temple. One thing that seems to be a green light for acceptance within Christianity is in the promise and faithful blessing to the eunacchs in Isaiah 56verses 4,5 and in Acts 8:26-39. Enunchs are the closest thing in scripture to transexuals as far as I can see. They are accepted by faith and forgiven like the rest of us. God actually sends philip to meet one such person whom he baptises and sends them on their way rejoicing. Their condition is not even the subject of conversation, no can't because they are a eunuch, etc.
I think so many Christian are oblivious to God's blessing for transsexual people and any other for that matter.
Hope that helps
Gina
Hugs
Nigella