And gender identity is utter bollocks. People can not 'feel male' or 'feel female'. They just are male or female. One can have absolutely no idea of how the other 'feels' anymore than a human can know how a donkey feels. They may be feminine or masculine, neither of which has anything to do with sex really.
Though as an athiest, I don't believe in souls anyway. So don't believe any of the 'born in the wrong body' stuff anyway. Which is lucky as 'born in the wrong body' is transphobic these days anyways
As are most beliefs that differ in any way from from 'transwomen are female and transmen are male' and 'biology is irrelevant'