Not once did Christ speak on sexuality, or sexual matters.
20 He went on: “What comes out of a person is what defiles them. 21 For it is from within, out of a person’s heart, that evil thoughts come—sexual immorality, theft, murder, 22 adultery, greed, malice, deceit, lewdness, envy, slander, arrogance and folly. 23 All these evils come from inside and defile a person.” Mark 7
16 “Are you still so dull?” Jesus asked them. 17 “Don’t you see that whatever enters the mouth goes into the stomach and then out of the body? 18 But the things that come out of a person’s mouth come from the heart, and these defile them. 19 For out of the heart come evil thoughts—murder, adultery, sexual immorality, theft, false testimony, slander. 20 These are what defile a person; but eating with unwashed hands does not defile them.” Matthew 15
Marriage i between a man and a woman(he also says that), so sex between people of the same sex is imoral.
However the old and new Testament talks a lot about eunuchs, and basically they are OK according to the bible.
Except eunuchs are not the same as transgender, it's just a man that can't have children. Legally female or not, to God it makes no diference since he doesn't follow trends and laws made by human society.
About Ranma, he didn't like being kissed by a man, and he only have any romantic interest in one when he is forced to by magic. He flirted with boys to get free food and he flirted with Ryoga to make Akane jealous because he didn't like Roga being close to her.