Every culture has:
people who believe it's possible for some special people to speak to the dead or cross back from death.
people who believe it's possible for some special people to perform both reproductive roles or cross between one sex and the other.
people who believe it's possible for some special people to communicate with or transform into animals or other natural elements.
people who believe it's possible for some special people to predict the future.
people who believe it's possible for some special people to do magic.
How these beliefs are expressed is cultural. Sometimes they are the mainstream beliefs codified into religion and ritual roles. Sometimes they are the core mysteries of mystics, heretics and cults. Sometimes they are not generally believed but indulged in friends as a personal harmless eccentricty. Sometimes they are treated as proof madness. But the core beliefs arise again and again.
Does the fact they occur so often in different cultures mean all these things are actually real?
I would say the reason these themes occur in every culture is simply because every culture is aware of sex, death and the natural world, wishes it could be certain about the future and could harness a free source of power or comfort.
These are things that have been us throughout our history, both familiar as, well, family yet also divides we cannot cross, experiences we can imagine but never know. Of course they have become go to symbols and metaphors in our cultures and religions. And by the same token, they are potent symbols and projections for our own subconscious.