In addition to tidings of peace and joy, St. Ambrose Church in Old Bridge has another message for the community this season: Don't even think about stealing the parish's new nativity scene. Not only are Mary and Joseph secured to the manger with steel cords, but the Baby Jesus also will be bolted to his crib and equipped with a high-tech GPS device to track anyone who might snatch him. "GPS. We call it God's Positioning System," the Rev. Bob Gorman, St. Ambrose's pastor, said. The Roman Catholic church is one of about 100 churches and synagogues around the country...