Orthodox Christians celebrate Christmas

Christmas falls on Jan. 7 for Orthodox

Christians that use the old Julian calendar instead of the 16th-century

Gregorian calendar adopted by Catholics and Protestants and commonly

used in secular life around the world.

Orthodox Christmas

Bosnian Serb children break the traditional Christmas bread to mark Orthodox Christmas Day festivities, in front Orthodox Church in Banja Luka, 350 kms north west of Sarajevo, Monday, Jan. 7, 2013. (AP Photo/Radivoje Pavicic)

Egyptian Christians greet men carrying a cross before the arrival of Pope Tawadros II, the 118th pope of the Coptic Church of Egypt, during a midnight Mass on the eve of the Egyptian Orthodox Christmas at St. Mark's Cathedral in Cairo, Egypt, late Sunday, Jan. 6, 2013. (AP Photo/Amr Nabil)

Pope Tawadros II, the 118th pope of the Coptic Church of Egypt, left, leads a midnight Mass on the eve of Orthodox Christmas at St. Mark's Cathedral in Cairo, Egypt, late Sunday Jan. 6, 2013. (AP Photo/Amr Nabil)