Philosophy great Daniel C. Dennett will be the guest, to discuss his new study, "Preachers Who Are Not Believers," just published and posted by In Faith at the Washington Post Web site. The hosts will also discuss the religious composition of the Supreme Court, a timely topic with the announced resignation of John Paul Stevens. Famous freethinkers born in April will be highlighted, with the bonus of a rendition of Tom Lehrer singing his "Vatican Rag."