It is called protest... buddy. These people are using humor to protest organized religion along with many of it's stupid laws. The humor is what makes it catchy and makes it popular so people spread it along with the idea of how stupid organized religion is. If you have been hiding under a rock for most of your life, then I guess you wouldn't be aware of Pastafarianism, but oh my gosh they are actually PAYING for a website too! So they definitely must be serious about the Flying Spaghetti Monster and his noodly appendages! Check it out for yourself:
http://www.venganza.org/