They(transmeds at least) believe in trans(pardon the pun)scending their biological sex and morphing into their perfect gender form(a idealized construct in their minds). I wouldn't be a bit surprised if many also believed in things like attaining "higher vibrations" or new agey stuff like that and perhaps waiting on the coming of the comet that would bring them into a higher plane of existence. When expectations are set so fantastically high for transition it's no wonder that it so often ends up in one place.

Also, many non-theistic religions still have a deity in some other form, it's just not anthropomorphized and seen as a deity. But it is worshiped like one.