What did the Protestant reformation do? It stopped 'religious unity' in it's tracks! ... "Religious unity had fractured with the survival and spread of Protestantism ... The Protestant reformation destroyed the concept of a world order sustained by the 'two swords' of Papacy and empire."
(Henry Kissinger, World Order, p.3,20).
https://www.end-times-prophecy.org/catholic-protestant-unite.html