[Hitman]

The Vatican propalated this doctrine officially (Unofficially it has been there for ever) mainly after the conflict with the protestants, when the church found itself sudenly divided in two and hence only half as powerful.

The true origin of it comes however from the jews (Not surprisingly, they put it in the old testament), the nation that has first used population increase as a means of power: More soldiers, more people to survive, more of their religion. The tactic was a typichal one of a hijacked nation, the way to cause enough trouble to their egyptian captors to ensure they would be released.

Islam has also been an expert in using it in recent times: More kids in their families means more muslims, ergo more power. No modern religion is free of that parasital doctrine, whose blindness and terrific consequences are easily understood. The most terrible perversion of it is that, like an arm's race, it forces almost everyone to do the same or risk being drowned in the overabundance of those groups which practice it.