@clacke @alienghic @Lazarou @cstross In Rome, state and religion were one and the same. In fact, prior to the rise of Christianity in Rome, emperor worship was used as a means of spreading Roman imperialism.
Rome becoming Christian wasn’t due to Christians taking over but an emperor appropriating an exotic religion to suit his dominance over others.
Specifically, it was Constantine who did this.
https://www.britannica.com/place/ancient-Rome/Cult-of-the-emperors
https://en.wikipedia.org/wiki/First_Council_of_Nicaea?wprov=sfti1