Blah blah blah yes yes I know what the GC positions are. The fact remains that being treated as the gender I want to be treated as and updating my hormone profile and getting surgery to align with that has taken away all of my social anxiety and body image issues, and that this is a widely reported phenomenon that has been well-studied over decades. Now whether as a matter of public policy you think we should have cruelty inflicted upon us or not is a separate question, but if you want to be cruel at least be honest about it.
> There is no gender
This is just plainly false. Gender is the social projection of sex, just like a shadow is a projection of an object onto a plane. When you are making claims like "[e]ach of us is born to a sex that is immutable", you are defining and setting up a system of gender.
There is no escape from gender because we live in a society. You don't get to say "there is no shadow". You cannot simply define it away like that.
> But they should not falsely claim the category of a biological sex that is not theirs
There is no falsehood going on, just a different way to set boundaries. One that is better because it leads to greater justice.
> Each of us is born to a sex that is immutable.
This depends entirely on your definition of sex. You have chosen to define sex to mean gametes. I have a different, more expansive definition that also includes sex characteristics. My definition is better than yours because it leads to greater justice in the world.
> The belief that gender exists, or that we have a gender identity that somehow infused the wrong body, is a profoundly religious idea. And by the same token, ungrounded in fact.
What you call religion, I call the massive weight of decades of medical science: https://medicine.yale.edu/lgbtqi/research/gender-affirming-c...
If you do not believe in the legitimacy of transgender identities, it is you who are choosing bigoted religiosity over actual science.