The Church has stated for decades that a person’s genes determines their sexuality. The changes in white matter (see
newscientist.com/article/dn20032-transsexual-differences-caught-on-brain-scan.html#.VYy_IpVRG_c) could be a chemical imbalance that requires treatment as in Bipolar disorder. Sex change surgery and hormonal treatment would be like treating acne with cigarette burns. There has not been enough unbiased scientific research into the causes of gender confusion or the long term effects of gender reassignment. The significantly higher suicide rate of post gender reassignment individuals compared to a control group speaks to the need for further study.
But its not politically correct to speak of these things.