I've long heard that the Jedi were based on the Jesuits. (Just look at the way Luke Skywalker dresses by Return of the Jedi.) And believe me, having gone to a Jesuit college, Yoda and Obi Wan's disciplining is heavily based on the Ignatian steps. (No, the Jesuits were not Buddhist syncretists, however... that comes from Star Wars' reliance on a Kirisawa movie.)
Star Wars also is based significantly on "Dune." (Jabba the Hutt was a giant slug-like creature, who fought to control the spice trade of a desert planet, whose human inhabitants were "moisture farmers.")
But to say that the Jedi were based on the Bene Gesserit has one gigantic flaw: The Bene Geserrit "witches" were exclusively women.
Humorous comparison: If Star Wars is based on Dune, then you also have to know that much of Dune is based Islamic. The Jawas, then, are those who live in the monastery (Yes, Jaba's palace was explicitly a monastery) which is now under Islamic domination. This would make the Jawas Franciscans. Of those who would be so unserious and competitive, Jesuits love to tweak Franciscans.
This is a Franciscan.
This is a Jawa:
Do you detect a tweak?
But to say that the Jedi were based on the Bene Gesserit has one gigantic flaw: The Bene Geserrit "witches" were exclusively women. I wouldn't call that gigantic, after all George Lucas had to change some things, or else he might get sued. Or he could have just called it Dune: With Lightsabers.
I have previously described Star Wars as a good film adaptation of Dune, not as a complaint that Lucas ripped off a lot of the ideas from it, but as an admission that the book Dune is way too complex for a two hour film. Lucas knew which parts to keep, added in light sabers and space battles, and what became unfilmable becomes a mega film hit. The difference in audience reception between the 1984 film Dune and Star Wars supports Lucas.
(But I still like the Dune books)