How was the Catholic Church different from the Lutheran and Calvinist?

During the period of the Reformation, an active struggle began against the Catholic Church. Martin Luther and John Calvin were the leaders of the new Protestant churches, the essence of which was to reduce the role of the church in the connection between man and God. In Lutheran and Calvinist churches there are no icons, they have no rituals of communion, there is no indulgence, and the role of a priest is not limited to mediation between man and God.