how did the Christianity spread after 100AD?

A look at how the Gospel spread in the beginning - What were the factors that allowed a persecuted faith to take over the Roman Empire?Depending upon the theological background, the answer to this question (what were the factors that enabled a persecuted, minority faith to take over the Roman Empire?) is extremely varied. A Yale professor, Dr. Ramsey McMullen (a secular scholar), SHOCKED the Christian world with his answer. You may be shocked as well!!