You could be a strictly atheistic materialist and still recognize that Chaz Bono is a woman. That's the science. The idea that she's a man is pure fantasy.
It's too bad that she's a woman with serious psychological problems. If she'd been reared by people like my parents, she'd probably have been fine.
Unfortunately, there is science and “science”.
The “science” that prevails in our decadent society recognized “transgenderism”, and even provides medical procedures for young alleged “transgenders” to avoid the normal puberty for their chromosomal sex altogether.
Under these circumstances, one needs a type of grounding that is not provided by the warped “scientific consensus” to separate reality from dangerous quackery. The Christian faith provides such grounding.