From The Wall Street Journal-
In the year 312, just before his victory at the Battle of the Milvian Bridge won him the undisputed leadership of the Roman Empire, Constantine the Great had a heavenly vision of Christian symbols. That augury led him, a year later, to end all legal sanctions on the public profession of Christianity.
Or so a pious tradition has it.
But there’s a more mundane explanation for Constantine’s decision: He was a politician who had shrewdly decided to join the winning side. By the early 4th century, Christians likely counted for between a quarter and a half of the population of the Roman Empire, and their exponential growth seemed likely to continue.
How did this happen? How did a ragtag band of nobodies from the far edges of the Mediterranean world become such a dominant force in just two and a half centuries? The historical sociology of this extraordinary phenomenon has been explored by Rodney Stark of Baylor University, who argues that Christianity modeled a nobler way of life than what was on offer elsewhere in the rather brutal society of the day. In Christianity, women were respected as they weren’t in classical culture and played a critical role in bringing men to the faith and attracting converts. In an age of plagues, the readiness of Christians to care for all the sick, not just their own, was a factor, as was the impressive witness to faith of countless martyrs. Christianity also grew from within because Christians had larger families, a byproduct of their faith’s prohibition of contraception, abortion and infanticide.
More here-
https://www.wsj.com/articles/the-easter-effect-and-how-it-changed-the-world-1522418701?emailToken=e7174aed99ae34ccc989c1fa9baebf1dwubyRg5%2F9izIx%2FQw9l2WsXN1PyAdyRuzCFQD3juXDqDJmgAjH0pI16p%2FaZrfkZbtb5dgjhDpqHGu6YJGJLyBGfZsEFwn%2BmYAf6uQAivAF6E%3D