“Illness. Like having 6 fingers.”
All you are doing is to dig yourself into a deeper and deeper hole with that kind of dishonesty. There are perfectly reasonable, legitimate, moral, and religious reasons for keeping sexual criminals out of private spaces reserved for certain genders. Basing your arguments on claims and definitions contrary to reality and contrary to actual biology is only going to defeat your purpose in protecting and defending the innocent from sexual criminals.
Now, with respect to your claim that anything you don’t like for reasons of religion or otherwise must be an illness, rather than a natural variation in sexual characteristics, you should be reminded that all Humans are a product of just such an illness. The eukaryotes in the center of each of our cells was originally a parasite tha fed upon the cells, but over time these parasites became a symbiotic lifeform that became a vital component for every Eukaryotic lifeform on the planet. Without this “illness” you would not exist. Now you can either set out on a fruitless mission to pretend and characterize every variation in sexual characteristics as an illness despite the impossibility of successfully doing so, or you can live in the real world and accomplish the task of protecting and defending innocent people from sexual predators using the social conventions for determining genders.