There had been nothing strange about the [Christmas] tree before, but now, with some one kneeling before it,—images, candles, … Grandfather merely put his finger-tips to his brow and bowed his venerable head, thus Protestantizing the atmosphere.
Source: wiktionary
Before the Reformation, whatever wars took place, there remained throughout Europe the underlying concept of an essential unity of Christendom, an idea that all states still formed part of a common body. Even after it, when Charles V came to an agreement with the Protestantizing princes of the empire in 1555, that idea and ideal remained.
Source: wiktionary