The higher birth rate outside the Empire, and the higher standard of living within it, made immigration or invasion a manifest destiny for the Roman empire then as for North America today. - Will Durant, in his "The Age of Faith."
When Rome succumbed to its economic, social, and moral problems, and was sacked by the barbarians, Christians were shaken in their faith, since Rome was revered as a bastion of Christendom. Saint Augustine spent his last years explaining that what happened didn't discredit Christianity.
In the not-so-distant future, American Christians are in for a faith test of goliath proportions when the wheels come off America. Disorientation and fear will rule the day for many people. God's answer will be the same as always. Obey and worship and trust; and love one another. As in the 4th & 5th centuries, He will build His house of prayer.
Wandering the Streets
15 hours ago