Moreover, by their own stories not only did God intentionally make that person trans but God likely deliberately did so to test the people interacting with said trans person on if they could love the trans person as required by their faith.
But no. It's never that because the religious argument is just a post hoc justification for the hate.
The other day I suggested fighting climate change was a net benefit even if it were "hoax." This some offended their Christian sensibilities and I was told:
Hypotheticaly then: if I had a 100% guarantee that murdering all babies would get them into heaven, but you'd go to hell, is it morally right to murder all babies? The ends justify the means, do they not? We need to get babies to heaven! So murder them all!
No, it's absolutely still monstrous. Because utilitarianism is stupid.
Stanislaw Lem had a short story about something like this. Basically a missionary came to a planet populated by cute innocent fur balls. He taught them the Bible, so they tortured him to death to make him a martyr and guarantee that he gets to haven, knowingly condemning themselves to hell out of compassion for the priest.
I like your way of thinking but for a Christian it doesn't work like that. They will likely say that despite God's intentions, this person went consciously against God's will and decided to commit a sin (because God gave us free will).
And then good luck explaining to them how nobody in their right mind would want to be ridiculed, cast out, ostracised, hated by so many people and become trans just simply out of spite.