What was the most important holy sacrament for medieval Christians?

Thereof, why was the church so important in the Middle Ages?

During the high Middle Ages, the Roman Catholic Church became organized into an elaborate hierarchy with the pope as the head in western Europe. He establish supreme power. Many innovations took place in the creative arts during the high Middle Ages. Literacy was no longer merely requirement among the clergy.

Also Know, what do Christians believe about sacraments? The Catholic Church teaches that there are seven sacraments or rites through which God can communicate his grace to an individual. Catholic Christians believe that the sacraments are channels for God's grace - every time they take part in a sacrament, they receive more grace.

Correspondingly, what does sacrament mean in Christianity?

Sacrament, religious sign or symbol, especially associated with Christian churches, in which a sacred or spiritual power is believed to be transmitted through material elements viewed as channels of divine grace.

How was the Roman Catholic Church corrupt in the Middle Ages?

Toward the end of the Middle Ages, the Catholic Church was rife with corruption. Even though priests, monks, and bishops were required to take vows of chastity, ( Celibacy for clergy became Roman Church law in 1079) many nuns and priests engaged in sexual affairs and produced children as a result of these unions.