Book excerpt: Religion is far too important to be taken seriously all the time--so says author Tom Sheridan, who in The Book of Catholic Jokes invites readers to laugh along with him and remember that faith can be--and should be--fun. Sheridan begins by discussing the importance of laughter and the relationship of humor to religion before launching into hilarious jokes. After all, Jesus said, "Unless you become like children, you cannot enter the kingdom of heaven."