Yeah, this should go without saying, but South Park should not be one of your primary sources of information for anything.
To be fair, he never said that it was. This is very easy to argue for pretty much any TV show, especially comical ones.
That said, I sometimes agree with the message behind South Park episodes, sometimes I don't. More often than not though I disagree with their methodology of utilizing humor and misleading logic to get their point across. Still entertaining nonetheless IMHO. I respect those that don't like the show, but saying its horrible is hyperbole. (Dada said it)
On the topic of Richard Dawkins, my opinion of him is pending. More research is required before I dismiss him. Research that I may or may not have time or energy (mostly the latter) to start unfortunately. I have read some positive things about him though as well as the thing you posted Dada. I don't like the idea that there are villains and heroes, but rather 'good people with ugly flaws' or even maybe 'bad people with redeeming qualities'.
The closest a person I've ever read about to reaching hero-dom is Nikola Tesla. And he definitely was flawed.