Once the unifying creed of the Roman Empire and many of its successor states Christianity's fortunes dwindled after the fall of Rome. These days Christianity remains a very minor world religion. The smallest of the Abrahamic faiths (at least according to some interpretations) it is heavily fractured and mostly relegated to the Northern Mediterranean and British Isles and often little more than a plurality in the regions where it is strongest. Yet such a state-of-affairs is not, as certain hack historians and preachers have maintained, inevitable. In the centuries following the collapse of the Western Roman Empire Christianity was able to thrive and even expand at times before Christendom as a whole stalled and was driven back.
How could the collapse of Christendom have been prevented and what would the world look like as a result?
How could the collapse of Christendom have been prevented and what would the world look like as a result?