Along the decriminalization of Christian worship during the rule of emperor Constantine, most of the territory of the Empire had Christian areas; amongst them, present Italy and Greece.
The main way in which the principles of humanism and the Protestant reformation were similar is that they both start putting emphasis on the individual, as opposed to a divine group.
He basically said "It's all good in the hood. We just need to chill, we ain't got no problem. Nothing here to be scared of."
Traveling to and from cities became easier. (I think thats correct)