Thus far no one has been able to prove or disprove the existence of God, the afterlife or reincarnation. Oh, and yes, even aliens, although there seems to be more evidence in that area than in the others. The absolute belief either way is the result of being told so, usually starting out when someone is very young. But, as Jenny pointed out, that is not the point of this thread.
Some of us have paid a heavy price for being ourselves. More precisely, for changing genders. That's how the outside world sees it anyway. Society believes conformity is normalcy. It also believes whoever you were is who you should always be with certain inevitable changes such as aging allowed. We pretty much buck that whole concept and the stubborn, the small minded, the conformists (or whatever it is that prevents one form opening their mind) want to punish us for that.
So it's perfectly understandable if any of us would wish to avoid that so long as we could still be happy. When I was in therapy I once said I wish someone had a magic wand to make things right. My therapist took out a clear lucite wand with sparkles in it and said, "I hear that a lot. So when I saw this, I bought it." Then she said she has pulled it out a lot when clients make comments such as mine. It's not uncommon to want a quick fix, even though we know the chances of it happening are slim.
Getting back to the subject... I've read a number of books about the afterlife, mostly from the point of view from people who had near death experiences. There's too many accounts that cannot be convincingly explained away through science. You can provide evidence to disprove that but only if you ignore contrary evidence. And if there is an afterlife, why can't there be the chance to have more than one mortal life? And why would each mortal life have to be in the same gender?
Some of the books I've read talk about us coming here as a choice. We choose to come here to learn things we cannot learn on the other side. One author said most do not choose to come here because this is such a hard life and those who do are all heroes. I think of that every time I see someone society has rejected. There's a lot of positive perspectives one can gain from believing in the after life, choosing to come here and reincarnation. So what's the benefit in rejecting those concepts?
In her book, Sylvia Browne does not say any of her TG clients were "cured". She didn't go into much detail about them. It was maybe a paragraph. But she did infer there was an understanding her clients had gained from the regression. What they did with that, she didn't say.
Right now I would never even entertain the thought of regressive therapy in helping to understand my gender identity conflict. If by some chance I emerged feeling I didn't need to transition after all, I would end up very depressed. I lost too much. But I might suggest it to anyone who has yet to begin their transition as a possibility to explore.