Oxford theologian Alister McGrath (author of "The Dawkins Delusion?" and "") argues that Dawkins is ignorant of Christian theology, and therefore unable to engage religion and faith intelligently. In reply, Dawkins asks: "Do you have to read up on leprechology before disbelieving in leprechauns?", and—in the paperback edition of "The God Delusion"—he refers to the American biologist PZ Myers, who has satirised this line of argument as "The Courtier's Reply". Dawkins had an extended debate with McGrath at the 2007 "Sunday Times" Literary Festival.