More than 100,000 Britons have recently downloaded “certificates of de-baptism” from the Internet to renounce their Christian faith. The initiative launched by a group called the National Secular Society (NSS) follows atheist campaigns here and elsewhere, including a London bus poster which triggered protests by proclaiming “There’s probably no God.” “We now produce a certificate on parchment and we have sold 1,500 units at three pounds (4.35 dollars, 3.20 euros) a pop,” said NSS president Terry Sanderson, 58.