With the suicide of David Reimer as prime example anjd and cornerstone combined with the failed hormone experiments on homosexuals in KZ-camps, is it possible that Gender Identity is set in stone from birth? I often cite the fall of Exodus and "praying the gay away" as the final nail in the coffin to those who disagree with me.

gender identity is poorly understood and very difficult to study, as opposed to genetic/chromosomally encoded gender. the interactions with societal pressures and norms add further layers of complexity that are very difficult to separate. That said, the majority of those who wish to, or do, change their gender identify are aware of being born into the wrong body from a very early age The supposition therefore is that gender identify is imprinted early in development and will inevitably be dependent on both genetic and local hormonal factors.

see
https://en.wikipedia.org/wiki/Gender_id … _formation