caption: In this Monday, April 13, 2020, photo a priest takes part in a Holy Monday ceremony held without worshippers at the Athens Cathedral, in Greece, during a lockdown order by the government to prevent the spread of the coronavirus. For Orthodox Christians, this is normally a time of reflection and communal mourning followed by joyful release, of centuries-old ceremonies steeped in symbolism and tradition. But this year, Easter - by far the most significant religious holiday for the world's roughly 300 million Orthodox - has essentially been cancelled.