Protestants - Divided Among Themselves

The new religious identities and communities which emerged from these conflicts—Lutheran, Calvinist, Anglican, and the more radical groupings often lumped together under the name “Anabaptist”—did indeed share some beliefs and attitudes in common. They all prioritized the written Word of God in the Bible over traditional Church teaching and discipline, and they all vehemently rejected the papacy and the allegedly materialistic religious system which the papacy headed. But they were divided among themselves—often lethally—on almost everything else. Within a single generation of Luther’s protest, “Protestants” were excommunicating, fighting, and persecuting each other, as well as the common Catholic enemy, and many were calling for a reform of the Reformation.

Source: Eamon Duffy - First Things, "The End of Christendom" (Book review of Reformations by Carlos Eire), November 2016, https://www.firstthings.com/article/2016/11/the-end-of-christendom