Christendom

n.	1.	The profession of faith in Christ by baptism; hence, the Christian religion, or the adoption of it.
	2.	The name received at baptism; or, more generally, any name or appelation. Pretty, fond, adoptious christendoms. - Shak.
	3.	That portion of the world in which Christianity prevails, or which is governed under Christian institutions, in distinction from heathen or Mohammedan lands. The Arian doctrine which then divided Christendom. - Milton A wide and still widening Christendom. - Coleridge.
	4.	The whole body of Christians.

Noun

1.

Christendom - 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" Synonyms: Christianity

body, Christian church, Christianity, church