At the beginning of the Christian era, priests spread Christianity throughout the Roman Empire. The popularization of Christianity first involved the civilian class in major cities. Christians opposed the consciousness of imperial power, so the monarchs regarded them as a threat, and organized violence to destroy them. However, this did not interrupt the expansion of this new faith, it bit by bit won the nobility and the most influential people, and quickly influenced the people around the emperor and the supreme monarch himself. In 312 AD, the Milan edict brought an end to the persecution. In 380 AD, the Theodosius edict made Christianity the state religion. 
the 4th century AD marked a turning point in Christianity.
Christianity has been opposed to imperial rule from the beginning, and has always struggled with the Roman emperor and his regime.