They worship the same God, but the principles of their faith are different. Five hundred years after the Reformation, there are still painful divisions between Protestants and Catholics.


In Germany, the country of the Reformation, a deep animosity divided Catholic and Protestant Christians up until a few decades ago. This division had deepened over the centuries through religious conflicts and wars.
It all started when Reformation took place, 500 years ago, as Martin Luther (1483-1546) tried to reform the Catholic Church. His attempt to do so instead led to a schism in the church.
On October 31, 1517, the publication of his Ninety-Five Theses, which outlined different abusive practices of the church, is considered the founding event that led to this division in Germany and the creation of the Evangelical church
Reasons below:

https://www.merchantv.com/2018/06/the-eight-differences-between-catholics.html

1. Understanding of the Bible

Catholicism and Protestantism have distinct views on the meaning and the authority of the Bible. For Protestant Christians, Luther made clear that the Bible is the "Sola Skriptura," God's only book, in which He provided His revelations to the people and which allows them to enter in communion with Him.
Catholics, on the other hand, do not base their beliefs on the Bible alone. Along with the Holy Scripture, they are additionally bound by the traditions of the Roman Catholic Church.

2. Understanding the church

Catholics and Protestants have a different view on the nature of the church. The word "catholic" means "all-embracing," and the Catholic Church sees itself as the only true church worldwide, under the leadership of the pope.
In contrast, the Protestant Churches which have emerged from Reformation, also called "Evangelical," which means "according to the Gospel," do not make up one united Church. There are rather several tens of thousands of different denominations around the world. Officially, all of these many churches are considered equal.

The rest here

https://www.merchantv.com/2018/06/the-major-differences-between-catholics.html

Ebuscoee:
1. Understanding of the Bible

Catholicism and Protestantism have distinct views on the meaning and the authority of the Bible. For Protestant Christians, Luther made clear that the Bible is the "Sola Skriptura," God's only book, in which He provided His revelations to the people and which allows them to enter in communion with Him.
Catholics, on the other hand, do not base their beliefs on the Bible alone. Along with the Holy Scripture, they are additionally bound by the traditions of the Roman Catholic Church.

not on the tradition of the Roman Catholic Church, Catholics don't base doctrine on Roman Catholic tradition, we base doctrine on the word of God whether received in the Bible or taught by the apostles the the early Church, what we accept is apostolic tradition.


example if the Catholic Church wish to see what is revealed about the divinity of Jesus, we look through the Bible and also see how the entire Christian Church taught by the apostles understood the word...that way we avoid false interpretation of the word