Not in the same category as the list you reference, but still ... "Go, Dog, Go" has made a indelible mark on me and my children ...

Completely appropriate that Dianetics is on the list. Of the five I've read (no, I won't tell you the other four), the only one I strongly object to seeing there is The Hitchhiker's Guide to the Galaxy.

Books that should be there but aren't ... Worlds in Collision by Velikovsky is a good candidate. I dislike speaking ill of the dead, but it occurs to me that both Margaret Mead's Samoa books and Silent Spring by Rachel Carson might qualify. The fact that Carson got some things right doesn't mean her ideas weren't turned into a cult.

Seems to be missing Phillip K. Dick's books. Also no Robert Anton Wilson, though he's virtually unreadable. They got Dune but they missed Ringworld. No Neil Gaiman or William Gibson -- Neuromancer is one of my all time favorites. How about Heinlein's Glory Road? LeGuin's Earthsea Triloy or Piers
Anthony's Xanth books? How about Stephen King's the Stand, or even better, It?

Or how about everything by Umberto Eco? Foucault's Pendulum, at a minimum, ought to be there.

C.G. Jung's Memories, Dreams, and reflections ought to be there, too. Some quality weird in that one.

And a cult list without H.P. Lovecraft? Granted, he was more of a short story writer than a novelist, but certainly the Cthulhu mythos needs to be included in there somewhere.

No Necronomicon, either.

Manly P. Hall's The Secret Teachings of all Ages has got some good Masonic weirdness to it, too.

Castaneda -- yup, read 'em all. Every scrap of that well-executed fraud's oeuvre I've read. Confederacy of Dunces -- Ignatius Reilly is my role model. Chariots of the Gods? Yup. For Ayn Rand, though, the cult value of Atlas Shrugs is way higher than the Fountainhead.

I've read about 13 on that list. What's missing is The Hobbit (though has that moved beyond cult status?) and the Illuminatus Trilogy by Robert Anton Wilson (I found it enjoyable, not unreadable -- Dune was unreadable, though I made it through the first four books of that trilogy.)

Thanks for bringing up Lovecraft, Abbot. He certainly deserves a place on that list!