This is pretty awesome. This atheist guy (he's an Australian, naturally) gets fed up with Mormons coming around in the morning and trying to convert him, so he flies to Utah to return the favor. Predictably, they don't appreciate it.
There's a bit of wonkyness at just one point in the second half, when they're going door-to-door talking to people, when he says that "we follow the teachings of Charles Darwin." Generally speaking, that's not really true for atheists. We tend not to follow anyone's teachings, that's kind of the point. Charles Darwin was, however, crucial for the development of atheism as a movement and a belief system, because it basically says that God is not necessary to explain life as we know it. Minor quibble, really, but just a point I wanted to make.