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"Medical condition" A boy goes to a doctor and says he really feels like a girl. The doctor sees dollar signs. A new medical condition. Expensive treatments and surgeries. The doctor makes money. The hospital makes money. The drug companies make money.
Think of it like depression. Depression used to have stigma: she's just feeling blue. Give her a spanking he'll get out of it. Then he goes to therapy and says how sad he is. How he can't or doesn't want to live. That's not a feeling, legally (US) that's a medical emergency. Suicide is taken seriously.
When a child (I'm making intelligent guesses. I'm not trans) goes to therapy, it's because he is distraught.
He sees his body and it feels alienated from him. Imagine what it's like to see your self but don't recognize yourself.
Dissociation with your body and psyche. That's. The medical part.
Gender is genetic (I'm female cause I have, for example, have physical maternal instinct). It's cultural (girls wear dresses in one country and burkas in another). It's environment and religion (God says this. You must listen) AND dysphoria above leads people to doctors and therapists.
To relieve the distortion, a woman who feels she should have a penis (I was told like a ghost leg. Your leg is amputated but you still feel it). He looks at his chest: something is missing.
These are psychological and physiological issues. Something you cannot just feel. You cannot just change.
People change their body so they're distraught feeling of body and self (what's missing) would align. I
i.e. I feel like I have a leg. I don't. People get fake legs. No one says it's wrong.
As for religion and god that doesn't solve the issue. It's telling the person that what he sees his face and body is who he is. You Are your body. Don't complain. Likewise. Dont cry. You're not depressed.
Gender is still studied because our societies still judge people based on sex. Soul=sex not spirit. You can color your hair. Even put contacts on. But Sex! That's not a god thing but a religious cultural thing.
Penis and vagina in the same room is a cultural and religious taboo for you. It goes beyond that. Without understanding, it doesn't sound like difference in informed opinion but geuine ignorance.
That's why you're getting replies. Opinions are fine but if the foundation isn't sound, it sounds like an insult.