transpeople and Christian reasoning

Truly told, I have yet to find someone who can explain to me the anti-trans message of Christianity that doesn't fall back on "male and female He created them". Because He makes, even now, does he not? He knows us in the womb - including those who turn up one gender physically but have the DNA of another gender. He knows and loves those who are hermaphrodite - he created them as they are. He knows and loves those who change sex at puberty through a biological shift (documented examples in many places). He knows and loves His people, whatever skin colour they have, whatever limbs they bear, whatever physical, genetic, or psychological differences they have from the two standard deviations of humanity.

I understand it from a financial POV: church-related schools will lose money and standing when they have to discipline non-Christian students for not toeing the Christian line against 'moral turpitude'.

I understand it from a gender-behaviour POV: if we can't determine who is male and who is female easily, simply, and early, then we don't know whether they're transgressing the 'appropriate behaviours' for their gender group.

But I can't find any reason other than "He created them male and female" - which certainly doesn't mention race or disability, intellectual capability, or anything beyond the basic genetic prototype needed for the reproduction of every person on the planet.

I used to think that maybe trans people were a 'mistake'. That they were a product of the fall, and that without sin everyone would have been born male or female. But that imputes a whole category of people who don't fit the mould into "you are the physical presence representing the existence of sin in the world" which...I can't think of anything less Christ-like, frankly. I feel like that dismisses the variety of humanity that God made, and the diversity of God's vision for humanity.

There's a whole conversation about disability in there, but I don't know how to have it. Yet.