Protestantism is the second-largest form of Christianity (after Catholicism) with a total of 800 million to 1 billion adherents worldwide or about 37% of all Christians. It originated with the 16th century Reformation, a movement against what its followers perceived to be errors in the Catholic Church.
The Reformation (alternatively named the Protestant Reformation or the European Reformation) was a major movement within Western Christianity in 16th-century Europe that posed a religious and political challenge to the Catholic Church and in particular to papal authority, arising from what were perceived to be errors, abuses, and discrepancies by the Catholic Church.
According to a 2019 study, Protestant share of U.S. population dropped to 43%, further ending its status as religion of the majority.    The decline is attributed mainly to the dropping membership of the Mainline Protestant churches,   while Evangelical Protestant and Black churches are relatively stable or continue to grow.
Mainline Protestant denominations, such as the Episcopal Church (76%), the Presbyterian Church (U.S.A.) (64%), and the United Church of Christ (46%), have the highest number of graduate and post-graduate degrees per capita of any other Christian denomination in the United States, as well as the most high-income earners.
Protestantism is a form of Christian faith and practice. It began in northern Europe in the early 16th century. At that time, they were against some parts of Roman Catholicism.
Protestant values encouraged scientific research by allowing science to study God's influence on the world and thus providing a religious justification for scientific research.  According to Harriet Zuckerman 's review of American Nobel prize laureates from 1901 to 1972, 72% were of Protestant background.
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This list gives only an overview, and certainly does not mention all of the Protestant denominations. The exact number of Protestant denominations, including the members of the denominations, is difficult to calculate and depends on definition. A group that fits the generally accepted definition of "Protestant" might not officially use the term.
A Protestant Bible is a Christian Bible whose translation or revision was produced by Protestants.Such Bibles comprise 39 books of the Old Testament (according to the Hebrew Bible canon, known especially to non-Protestants as the protocanonical books) and 27 books of the New Testament for a total of 66 books.
Protestantism is a Christian minority on the island of Ireland.In the 2011 census of Northern Ireland, 48% (883,768) described themselves as Protestant, which was a decline of approximately 5% from the 2001 census.
Evangelicalism (/ ˌ iː v æ n ˈ dʒ ɛ l ɪ k əl ɪ z əm, ˌ ɛ v æ n-,-ə n /), evangelical Christianity, or evangelical Protestantism, is a worldwide trans-denominational movement within Protestant Christianity that maintains the belief that the essence of the Gospel consists of the doctrine of salvation by grace alone, solely through faith in Jesus's atonement.