Relations between religion and state in Christianity

One of the most important issues in religions and religious communities is relation between religion and state. This relationship in Christianity, throughout its history had ups and downs. Based on the theoretical and practical principles of Christianity, which is derived from the Bible and the views and actions of Jesus Christ and the apostles, Christianity does not have a social and political program. In Christianity, religion is distinct from politics and people are obliged to obey the government. In its initial approach, Christianity had political silence and social isolation. But after the official formation in the fourth century, this rule changed and Christians, despite their foundations, entered society and politics seriously, and went so far as they quarreled and fought with kings on sovereignty and created "Doctrine of the two swords". In any way, by studying the sources and history of Christianity and in order to raise awareness about the relation between Church and state from the beginning to the end of the Middle Ages, the article illustrated this relationship.