What are the motifs in The Gospel of the Flying Spaghetti Monster by Bobby Henderson?

Piracy is a recurring idea. There are many reasons why Henderson may have chosen pirates to be a centerpiece in the FSM religion. For one, the idea is just plain silly, so fits in with the satirical wit of the rest of the book. However, they might be intended as a parody of Christian crusaders or missionaries. Pirates were out of the mainstream for their crimes at sea, outcasts as Christians once were when persecuted for their beliefs. At the same time, they are rebellious versus conformist and the stuff of boyhood adventure fantasies (as FSM Heaven is a big boy's fantasy). As such, they appeal to a broad audience of potential Pastafarians, such as college students, who would be the most susceptible to joining ranks.