POMPTON LAKES - Some say the Christmas spirit is lost in all the buying and holiday frenzy. But at St. Mary's parish on Christmas Eve, it jingles loud and clear. "It's about sharing," said Sarah Boughton, 10. Not just presents wrapped with paper and topped with bows, she said, but her own gifts: "Like singing." Boughton was among about 450 people - at least half of them kids - attending the 2 p.m. standing-room-only, children's liturgy at St. Mary's Catholic Church on Saturday. St. Mary's on Pompton Avenue is one of the largest parishes in the Paterson Diocese, which includes...