NEWBURYPORT — A Secret Santa gift exchange has always been a popular tradition observed in Kathleen Petrie's elementary school classroom, but the jolly old elf is not welcome at Molin Upper Elementary School this year. Principal Lorene Marx ended the Christmas-themed celebration out of deference to those students who don't celebrate the Christian holiday, St. Nicholas and his flying reindeer. And at least one parent is upset about the loss of the beloved holiday icon. "I think it is punishing the majority to possibly help a very few," said David Logan, a parent of a child in Petrie's classroom. "I...