It is true that during the 19th and early 20th centuries, immigrants from predominantly Catholic countries faced blatant discrimination from the American-born majority white Protestants.
Protestantism arose in Christian Europe during the 16th century Reformation, and Protestantism is said to have three core beliefs: 1) The Bible is the ultimate authority on religious truth. 2) People are saved only by God's "grace" (i.e., excess gift). 3) All Christians are priests.
Protestants are Christians who belong to a sect of the Church of Christ that split from the Catholic Church in the 16th century. Protestant means relating to Protestants or their churches.
In general, Martin Luther and his other 16th-century Protestant reformers believed that salvation could come only through faith in Jesus and the atoning sacrifice (sola fide) on the cross, whereas in Catholicism , taught that salvation comes through the combination of faith and goodness.
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