A symbol of Christianity that sits atop church steeples, dangles from necks and hangs on walls is now ending up in the mouths of the faithful, over the objections of some religious officials. A mass-produced chocolate cross is being sold this Easter by Russell Stover Candies Inc. in about 5,000 stores nationwide, which experts say is apparently a first for a major American company. "Obviously they've seen that there's a market for chocolate crosses at Easter," said Lisbeth Echeandia, a consultant for Candy Information Service, which monitors candy industry trends. "I don't see it growing tremendously but I think there...