CHRISTENDOM
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”
Source: WordNet® 3.1
Chris"ten*dom, n. Etym: [AS. cristend; cristen a Christian + -dom.]
1. The profession of faith in Christ by baptism; hence, the Christian
religion, or the adoption of it. [Obs.] Shak.
2. The name received at baptism; or, more generally, any name or
appelation. [Obs.]
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. Hooker.
Source: Webster’s Unabridged Dictionary 1913 Edition