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I am not sure the Church was "hard" during the Middle Ages. The Church spent a lot of energy providing for the sick and poor, giving people refuge, representing the needs of the poor to the kings, and protecting people. There is a link below to a related question, "What was the role of the Church in the Middle Ages?"
The king and the Church.
Bb
The church had the most power in the middle ages because it was the one thing that united people.
because jesus was alive
The Catholic Church created stability because people believed that they had to follow Church teachings to avoid damnation.
they went to church and prayed in large cathedrals
teaching people about the bible saints and mortality
Lutheranism gained support, especially among middle class people in German-speaking cities. Church authorities responded to Lutheranism by excommunicating Martin Luther.
Most people of Western Europe, for most of the Middle Ages, were linked by a belief in Christianity, in the communion of the Catholic Church.
Your question is far too broad and assumes too much. You need to be more specific. You need to define 'church' and 'people'. Many 'people' did not, adherents of Islam for instance.
The Catholic church regulated everything in the lives of people. They taught that man was born in sin and to be forgiven people had to go through the church. This included the nobility and they kept a tight rein on all factors of life.