What's your favorite science fiction novel, series or short story?

Novel: I Robot by Isaac Asmov(the movie sucked, and didn't resemble the plot of the book even a little). Songs of Distant Earth by Arthur C. Clark was also quite thought provoking, and besides he's on of my favorite "hard" science fiction authors. I love Kurt Vonnegut's stuff, but I'm not sure if it would be classified more as black satire than sci-fi.

Short Story: This one goes to Asmov again. The Final Question is one of the best short stories I've ever read, in the science fiction genre or otherwise. Highly recommended.

Series: this one is easy. Dune, ftw.

Fictional religion: Omnianism from Discworld.

Stranger in a Strange Land

R.A. Heinlein

Edmund Dantes

The Count of Monte Cristo

Or

Hank Morgan

A Connecticut Yankee in

King Arthur's Court

I like the "Ender" series by Orson Scott Card, but anything by William Gibson gets an A+. I don't recall having a favorite literary religion.

Either:

Roadside Picnic - Arkady & Boris Strugatsky

Or:

Rendezvous with Rama - Arthur C Clarke

I can't think of any memorable fictional religions...

Edit:

Oh, there was the "Day One" apocalyptic cult in "The Song of Phaid the Gambler" by Mick Farren - a bunch of heavily-armed fanatics.

The Culture novels by Iain M. Banks.

http://en.wikipedia.org/wiki/The_Culture

http://www.iain-banks.net/

There is a religion in one of his books, where the inhabitants of a shell world, have a god that is actually a real creature living a the centre of the world.

It makes a nice change to have a god that actually exists.

The Left Hand of Darkness by Ursula K Le Guin

Pretty much anything by Larry Niven, Iain M Banks or Stephen Baxter.

Mother Night. by Vonnegut

Bokononism (from Cats Cradle, also by Vonnegut)

Journey to the West.

Buddhism.

Dune

Jedi (although it's now got real life followers lol)