Roman Catholic vs Protestantism

Roman Catholics do not believe that the Bible alone is enough. They believe that both the Bible and Sacred Roman Catholic tradition are necessary for salvation. Protestants believe that in the faith of Christ alone, believers are vindicated of all their sins. Catholicism is a denomination, and is, therefore, a subset of Christianity. All Catholics are Christians but not all Christians are Catholics. A Christian refers to a follower of Jesus Christ who may be a Catholic, Protestant, Gnostic, Mormon, Evangelical, Anglican or Orthodox, or follower of another branch of religion. The Pope is the head of the Catholic Church while Protestantism is a general term that refers to Christianity that is not subject to papal authority. Catholic used statues and pictures, permitted as means of inspiration while protestants do not used any of those. They both worship in church, chapel and in cathedral.

This week, I've learned that Roman Catholics and Protestants differ most profoundly over institutional authority. They compete and don't accept each other's authority.  Roman Catholics are governed by one centralized, hierarchical authority structure. This authority covers both governance and teachings. Rank-and-file individuals may debate but they do not make authoritative interpretations. Protestants have many different confessions or denominations. Even within a denomination, institutional authority might not be centralized. Many Protestants allow decisions and teachings to be made by congregations or even by individual believers such as interpretation of a verse, election of deacons and there are more. Thus, every single Protestant church rejects the Pope's authority. Likewise, the Roman Catholics rejects the authority of all Protestant clergy and none are allowed into their hierarchy.
Moreover, both differ as well in beliefs and practices. The deepest doctrinal differences probably concern the role of scripture and church interpretations. Sola scriptura was the most important protest against the Catholic approach to authoritative teachings. It's hard to generalize about Protestants, their beliefs and practices vary. Catholics have some distinctive approaches, for example ideas and devotion towards Mary. Key rituals also differ just like the sacraments. Protestants tend to believe that they differ with Catholics over beliefs about salvation and works.