The fact that ‘I’ am a unity of body and soul means that it makes no sense to suggest, as we have seen Judith does in the Church of Scotland report, that ‘I was born in the wrong body.’ There is no ‘I’ separable from the body we possess. What ‘I’ means is the person who exists in this particular combination of body and soul. The suggestion that I should have been born in a different body really means that I should have been a different person, but in that case I would not exist, so the suggestion is asking for the impossible.
What is also impossible is for someone to change their body from male to female or vice versa. It is possible through the use of hormones and plastic surgery to change to a certain extent the way our bodies function and their outward appearance, but we cannot change the fundamental character of our bodies as male or female. We can produce what Paul McHugh calls ‘feminized men or masculinized women, ‘  but we cannot make a man into a woman or a woman into a man.
The evidence of Scripture agrees that human beings are bodily creatures that are male and female and are able to reproduce as such, but it supplements the witness of natural reason in this regard in two key ways.
First, it teaches in the creation narratives in Genesis 1 and 2 and also in the words of Jesus in the Gospels (Matthew 19:4, Mark 10:6) that we are not a dimorphic species by accident, but because God in his goodness and wisdom created us as such so that men and women together can rule over and care for the world on God’s behalf and together can produce offspring who can continue this vocation in their turn. Scripture as a whole further teaches that the dimorphic structure of the human species is also the basis for marriage (Genesis 2:23-24) through which human beings are called to bear witness to the marital relationship between God and his people, which has begun in this world, but will be finally consummated in the world to come (see Ephesians 5: 21-33 and Revelation 19:6-9, 21:2-4).
Secondly, it teaches that our bodies are an eternal part of who we are.
Read it all.