I love the, "Sand houses" joke, It's not exactly racist, aren't Egypt and Iraq surrounded by sand, and aren't these countries predominantly full of Muslims. As for your religion, go sell crazy elsewhere I don't buy a word of it. Why go out of your way to slam an episode? Seriously were you that upset by the jokes? Were all free to think as we please we are not being brainwashed by Matt and Trey, we can think for ourselves even when we watch, "unholy" shows like South Park.
Cartoon Wars is the bomb though seriously, I love this developed relationship between Cartman and Kyle where they simply hate each others guts. The characters in South Park have come along way from the fart humour and the, "one liners" from the earlier episodes.