None of the groups you mentioned have a mental disorder that makes them who they think they are. Sorry to say Bob but your immature cheap shots don't phase me.
What are you, some kind of "Christian" ayatollah, comrade?
I'm sure in your eyes that might be the case, but I'm not a Christian and I'm not debating this subject or any subject from a religious perspective. I came at this from logic, and logic says if you are born with a dick, you are a man and if you are born with a vagina you are a woman. To state anything else flies in the face of biology.
If someone comes up to you and claims to be God, do you pray to them? If someone comes up to you and claims to be the Queen of England, do you bow to her Majesty? These are all mental disorders and going by your reasoning, we must accept these people as they are and act accordingly.