The NBC switchboard was still getting calls yesterday from people who couldn’t believe their eyes when singer Sinead O’Connor tore up a picture of the pope on “Saturday Night Live.”“There was an immediate viewer response that continued Sunday and continues today,” said NBC spokesman Curt Block. From the show’s conclusion through yesterday, the network received more than 900 calls from people who didn’t like the show — and seven who did. “I was offended; the executive producer, Lorne Michaels, likewise was offended and surprised,” said Block. O’Connor, who was in England yesterday, wants the action to speak for itself, said spokeswoman Elaine Schock. O’Connor’s label, Chrysalis, declined to comment. The stubble-haired Irish singer, appearing early Sunday, stood behind a Rastafarian scarf and several candles while singing “War,” a song by the late Jamaican performer Bob Marley. “We have confidence in the victory of good over evil,” O’Connor sang. “Fight the real enemy,” she said. Then she held up an 8-by-12 photo of the pope and slowly ripped it into several pieces.