Christendom, Christianity (noun)

the collective body of Christians throughout the world and history (found predominantly in Europe and the Americas and Australia)

"for a thousand years the Roman Catholic Church was the principal church of Christendom"

Christendom (ProperNoun)

The state of being a Christian.

Christendom (ProperNoun)

The Christian world.

Christendom

Christendom, or the Christian world, has several meanings. In a cultural sense, it refers to the worldwide community of Christians, adherents of Christianity. In its historical sense, the term usually refers to the medieval and early modern period, during which the Christian world represented a geopolitical power juxtaposed with both paganism and especially the military threat of the Muslim world. In a contemporary sense, it may simply refer collectively to Christian majority countries or countries in which Christianity dominates or nations in which Christianity is the established religion.