While those are evil, I wouldn’t call them Gnostic.
Gnostic religions are those that say you need to learn certain secrets to rise higher in “esteem”
So, the “Church” of Scientology is definitely a Gnostic type religion (though having nothing related to Christianity). I would say that Mormonism and Jehovah’s witnesses are also Gnostic, actually more “Gnostic”
That’s one of the forces Judeo-Christianity is up against.
They all have in common that man can be perfected. They may each define that idea a bit different.
JW’s and Mormons believe that you can work for your salvation.
Church of Scientology believes that the mideochlorians can save save you. (Sarc)
The left believes that man must strive to not leave a mark on earth in order to be saved.
I’m not saying that they are perfectly Gnostic, but they share that one aspect Gnosticism, the imperfection of mankind, working towards salvation and leaving the flesh behind.