8. (a) Roughly, Christendom makes up what part of the world population? (b) What controversial questions have arisen as regards Christendom and Jehovah’s witnesses, and how or by what rule can the matter be settled?
8 The so-called Christian world, or Christendom, is the most populous religious system on earth today.
... Roughly, it makes up a third of the world, for the world population today is estimated as being 3,420,000,000, whereas Christendom is made up of 977,383,000 professed Christians.