It was only from the fourth century on that there was an obviously dominant, unified, institutionalized form of Christianity – Catholicism.
Think of the good work that could be done through secular organizations using money saved by not subsidizing churches.
Church people commonly claim that if all communities were Christian the result would be moral health, peace, and happiness.
Throughout history, powerful governments have tried to control popular opinion, and often haven’t hesitated to flagrantly manipulate the truth.
Consider Christian history. There have been literally hundreds of wars started or inflamed by Christian intolerance.
Pliny the younger did mention the existence of Christians in Asia Minor in 112 CE, but wrote nothing about Jesus the person.