What is the reason for the kalosal significance of the church in the life of a medieval person?

In medieval society, the church played a significant, and sometimes the main role. The Church was an inalienable ally of the state in the East and a competitor and equal to it in the West of Europe. She inspired the illiterate strata of the tax-paying population (peasantry), which accounted for 90% of all residents, that all power is from God. Lack of education and fear of people in front of natural phenomena, war, disease and poor harvest made the church true in the last instance. It is easier to point out that a poor harvest, hunger or war is all the machinations of the Devil, than to explain that this is a lack of foreign or domestic policy of the state.