These were interesting answers. A quick google search tells me that Reddit overall is over 70% male. But in exchristian, while a small majority of users are men, over 40% are women. As a man, I may be pontificating about something I don't understand, but I wonder if this is connected to the sexism inherent in much of Christianity and Christian teaching. Women may be more likely to leave Christianity than men, because they are more likely to feel unwelcome in a sexist environment. The 5%+ operating outside of the traditional genders may be feeling a similar thing. Trans, Non-Binary, and Genderfluid people probably struggle to find a place in Christianity and Christian doctrine unless they suppress their authentic self. Again, I may be talking out of my arse here, and those with actual experience of this can hopefully provide more insights in the comments.