I don’t personally believe in illuminati since I’m not aware of any strong scientific evidence supporting such ideas. But I would be more open to the idea if I were made aware of some strong scientific evidence!
There are probably some people that call themselves “Illuminati” and do secret society stuff. Nice way to pass the time if you’re into that sort of thing! Do they secretly control the world? No. There’s a saying about never needing to invoke conspiracies to explain things that are quite consistent with greed and incompetence 😉