THIS IS A LAME JOKE! On religious or comedic grounds, there's just nothing original or especially funny about it.* I can take a joke on my own beliefs as much as the next guy, but this just doesn't really give me the urge to laugh. Henderson's in a long line of people who have ridiculed Christianity, Christians and various religious groups and beliefs, and he just fails to stand out. And the whole joke fails because ID is not a religion, so it doesn't make sense to ridicule ID by comparing it to a religion, no matter how bizarre.
*OK, the pirate thing is funny, until you realize that there are still plenty of pirates in certain parts of the world, so the joke doesn't even work. Then there's the fact that this amateur hack of a comedian just put it in the middle of a letter where it didn't belong, so it just doesn't flow. Unless he wanted to point out that it is a more viable theory than evolution, but it doesn't seem likely he would realize that.
So, what are you all so tickled about?