It's Christmas around the world and Long Island's faithful flocked to churches to observe Christmas Mass.People of all ages packed St. Agnes Cathedral in Rockville Centre to celebrate the day and what it's about. For Gladys, Christmas is about love, family, children and God. Nick, 11, says the day is about celebrating Christ's birth. And for little Bobby Erban, 5, it's about Jesus' birthday, snow and Santa Claus. Many Long Islanders are also enjoying spending the day with their families.