Now you have me jumping at the smallest noise I hear lol. So voodoo priestess, mediums, etc all contact jinns through magic? And I can kind of understand ancient people worshipping these beings but why still in this day of age? Espicially if they've been reduced to being worshipped by the outer fringes of society. Is their power really that grand?You have to first understand their history. These entities were the original inhabitants of Earth, before the creation of Adam (as). Due to their corruption they were driven out of the mainland into Island(s) in the southern ocean. This should tell you how ancient they are.
The majority of ancient peoples acknowledged them as gods, spirits, demons, etc. There are several mediums one can contact/summon them. The main medium used is magic. Have you heard of Talut and Malut, the Angels sent by Ilahey to test the people with evils of magic? They descended around the time of Nimrod I believe, in the region of Babylon. Have you noticed occultists and their mention of Babylon/the Tower?
Then there was Sulaiman (as) and the books of magic ascribed to him - buried supposedly under his throne. Again occultists mention his ring, etc. and its power in their lore.
These occultists are very aware of the Jinn, as the Jinn are aware of them. A majority of their writings can be traced back to the two time periods mentioned previously.
They have their little gangs: pagan witchcraft, Wiccans, Thelemites, Right Hand & Left Hand magicians, Chaos magicians etc. but all seek to communicate with the Jaann.