In December 2005 Bobby Henderson received a reported US$80,000 advance from Villard to write "The Gospel of the Flying Spaghetti Monster". Henderson said he planned to use proceeds from the book to build a pirate ship, with which he would spread the Pastafarian religion. The book was released on March 28, 2006, and elaborates on Pastafarian beliefs established in the open letter. Henderson employs satire to present perceived flaws with evolutionary biology and discusses history and lifestyle from a Pastafarian perspective. The gospel urges readers to try Pastafarianism for thirty days, saying, "If you don't like us, your old religion will most likely take you back". Henderson states on his website that more than 100,000 copies of the book have been sold.