Belloc actually handles that thesis quite handily in his book http://books.google.com/books?id=5ryGAAAAMAAJ&pg=PA21&lpg=PA21&dq=belloc+on+the+roman+church&source=bl&ots=rCbzs8Z0_v&sig=8np-hr2MoW49X_gX5lyyCxcQgWU&hl=en&ei=rUCiTcivE-H30gGJo6ifDQ&sa=X&oi=book_result&ct=result&resnum=5&ved=0CDIQ6AEwBA#v=onepage&q&f=false
The thesis that spiritual and moral generation or exhaustion is what spells the end of civilizations isn’t a new one. It’s very persuasive, and you can see that more than a few influential people believed in it with regard to the Roman State.
What I’m suggesting is that the calamities which followed on the heels of the extreme moral exhaustion of the Roman Empire, which wasn’t entirely Christian at the time you speak, maybe about half, came as a result of the moral decay which negatively effected the fertility of the women and the desire to form families. You can see from contemporaries in the quotes that Sheen is making that the family is under attack and the generality of the population is mercilessly immoral.
I’m actually surprised to see this much resistance to the idea here of all places. After all, this IS a socially conservative site. We do believe, like Richard Nixon, that the State will suffer correspondingly if the people are not moral, and all around us we see these influences destroying the coherence of American Society, not only on an intellectual plane, without which there can be no right actions, but in every aspect of society from folk culture down to the elites themselves who regard those of us who hail morality with contempt, even if they agree with us publicly.