All these things belong to occult, elitist groups who keep their knowledge and insights secret to themselves. And to gain access to this knowledge, one must join their organizations and sects and rise in rank. While the Abrahamic religions advocate universalism, well, not all knowledge is secret. Anyone can have it, and it's easily accessible on the internet.
So why hide the truth? Why keep it to yourselves? In reality, you keep it mysterious because you do evil and sacrifice babies and kittens in your blood-soaked orgies.