Knowledge turned to the occult is visible, if two sides of the coin exist at same place and time. A pretty example is the ridicule for spirits and attachment from science, while the Vatican have a lot of exorcists in good payment. At the end of his life, the highest exorcist at Vatican demanded one exorcist for every congregation. For a problem that officially does not exist and is ridiculed in public.
Humanity has become the jumping ball between different interests, the ruling cabal like to have a flyer attachment for every human for control reasons. While religion wants also control over humans, but can only reach their target if there is no flyer and none benevolent spirit attached to humans. Science like to ridicule that all, to sell colored pills that control the mood.
In a world of deception all groups like to color the world in their vision, to separate the victims into tribes that can be controlled easy. None of the groups like to have free mankind, contacted to benevolent spirits as helpers, thats why witch hunt and hunt for mystics took place for so many years, to hunt wisdom down. To burn the library of Alexandria and burn gnostics at the stake and harvest old knowledge into the secret library at the Vatican.
Exorcism is a relict from this old knowledge, they know about the competition with the spirit world and like to maintain their flock. Exorcism will be used even to disconnect Jesus from a human, because he and his teaching is a competition to 3D worshiping. Free humanity is the target, to maintain control over it through lack of knowledge and ridicule. At the end it depends on you, to take your overview in the occult to see the gateway out and why benevolent spirits wait for your contact to serve.