Why is john Calvin unhappy with the catholic church?

John Calvin was unhappy with the Catholic Church primarily due to its practices and doctrines that he believed strayed from biblical teachings. He criticized the Church for its emphasis on tradition, the sale of indulgences, and the perceived corruption within its hierarchy. Calvin advocated for a return to a more scriptural foundation of faith, emphasizing predestination and the sovereignty of God, which he felt were neglected by the Catholic Church. His reformative ideas ultimately contributed to the development of Protestantism.