The holiday shopping season kicks off this week with Black Friday, the busiest shopping day of the year. The new documentary “What Would Jesus Buy?” follows Reverend Billy and the Church of Stop Shopping gospel choir on a cross-country tour, preaching their message in such destinations as the Mall of America, Wal-mart headquarters, Starbucks and Disneyland. We speak to Rev. Billy, and the film’s producer Morgan Spurlock, who gained fame with his documentary “Super Size Me.”