I completely agree with you save one thing. God made our soul and our body. It was created in his image. He doesn't make mistakes either... I don't think he made a mistake with either one of us or anyone trans for that matter. We are unique on his eyes and he has created ways for us to be complete. Gender means nothing to God, if it did the angels would have a gender and they are not male or female. I believe gender was introduced to humans in the garden of eden when Adam and eve sinned... until then they had glorified bodies and had no need for it... just like we will have glorified bodies when we die.
The bible is the word of God and I believe what it says but even Jesus said that when he came to earth and died, he fulfilled prophecy and the old ways were done away with. That means that most of the ammo/scripture that is hurled at us is not important but not necessarily relavant since the coming of Christ. The new testament speaks about not judging and Christians forget that their action judge just as much as their words... sometimes more.
There is an interesting passage that I always refer to in Matthew 19 where Jesus speaks about the eunuch. Here's the kicker... the passage makes sense to me as I am sure it will to you without so much of an interpretation. Jesus says to those who will understand, they will understand. Everyone else can skip over it because it doesn't apply to them. Take a look, maybe you've seen this passage, maybe not but it bears sharing. These verses can be very broad but they still make a point.
11 Jesus replied, "Not everyone can accept this word, but only those to whom it has been given. 12 For there are eunuchs who were born that way, and there are eunuchs who have been made eunuchs by others—and there are those who choose to live like eunuchs for the sake of the kingdom of heaven. The one who can accept this should accept it."
I wish Christians would understand that this is not something we chose or something we can easily turn off. I struggled for a long time thinking I was failing as a Christian because the devil was tempting me and I was succumbing to sin when that wasn't the case at all. Gender is a man made subject and our soul just doesn't align with the outer shell. What's it matter anyway? Eventually it will be dust anyway!?!? So in reality what are we changing?
I too believe whole heartedly that God is on board with my decision to transition but it's taken me a long time to understand it and have faith that it's true. This is just my perspective... God speaks to each of us differently

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