One school of thought attributes Calvinism with setting the stage for the later development of capitalism in northern Europe. In this view, elements of Calvinism represented a revolt against the medieval condemnation of usury and, implicitly, of profit in general.[citation needed] Such a connection was advanced in influential works by R. H. Tawney (1880–1962) and by Max Weber (1864–1920). Calvin expressed himself on usury in a 1545 letter to a friend, Claude de Sachin, in which he criticized the use of certain passages of scripture invoked by people opposed to the charging of interest. He reinterpreted some of these passages, and suggested that others of them had been rendered irrelevant by changed conditions. He also dismissed the argument (based upon the writings of Aristotle) that it is wrong to charge interest for money because money itself is barren. He said that the walls and the roof of a house are barren, too, but it is permissible to charge someone for allowing him to use them. In the same way, money can be made fruitful.[136] He qualified his view, however, by saying that money should be lent to people in dire need without hope of interest, while a modest interest rate of 5% should be permitted in relation to other borrowers.

Christians believe Jesus' death and resurrection makes it possible for believers to attain forgiveness for sin and reconciliation with God through the atonement. Reformed Protestants generally subscribe to a particular view of the atonement called substitutionary atonement, which explains Christs death as a sacrificial payment for sin. Christ is believed to have died in place of the believer, who is accounted righteous as a result of this sacrificial payment.

Reformed theologians believe that God communicates knowledge of himself to people through the Word of God. People are not able to know anything about God except through this self-revelation. Speculation about anything which God has not revealed through his Word is not warranted. The knowledge people have of God is different from that which they have of anything else because God is infinite, and finite people are incapable of comprehending an infinite being. While the knowledge revealed by God to people is never incorrect, it is also never comprehensive.

Most objections to and attacks on Calvinism focus on the "five points of Calvinism," also called the doctrines of grace, and remembered by the mnemonic "TULIP." [...] The central assertion of these points is that God saves every person upon whom he has mercy, and that his efforts are not frustrated by the unrighteousness or inability of humans.

Calvinism (also called the Reformed tradition, Reformed Christianity or the Reformed faith) is a major branch of Protestantism that follows the theological tradition and forms of Christian practice of John Calvin and other Reformation-era theologians. Calvinists broke with the Roman Catholic Church but differed with Lutherans on the real presence of Christ in the Eucharist, theories of worship, and the use of God's law for believers, among other things. Calvinism can be a misleading term because the religious tradition it denotes is and has always been diverse, with a wide range of influences rather than a single founder. The movement was first called "Calvinism" by Lutherans who opposed it, and many within the tradition would prefer to use the word Reformed. Since the Arminian controversy, the Reformed (as a branch of Protestantism distinguished from Lutheranism) are divided into Arminians and Calvinists; however it is now rare to call Arminians Reformed, as many see these two schools of thought as opposed, making the terms Calvinist and Reformed synonymous.

Due to Calvin's missionary work in France, his programme of reform eventually reached the French-speaking provinces of the Netherlands. Calvinism was adopted in the Electoral Palatinate under Frederick III, which led to the formulation of the Heidelberg Catechism in 1563. This and the Belgic Confession were adopted as confessional standards in the first synod of the Dutch Reformed Church in 1571. Leading divines, either Calvinist or those sympathetic to Calvinism, settled in England (Martin Bucer, Peter Martyr, and Jan Łaski) and Scotland (John Knox). During the English Civil War, the Calvinistic Puritans produced the Westminster Confession, which became the confessional standard for Presbyterians in the English-speaking world. Having established itself in Europe, the movement continued to spread to other parts of the world including North America, South Africa, and Korea.[13]

Reformed theologians teach that sin so affects human nature that they are unable even to exercise faith in Christ by their own will. While people are said to retain free will in that they willfully sin, they are unable to not sin because of the corruption of their nature due to original sin. To remedy this, Reformed Christians believe that God chose or predestined some people to save. This choice is believed to be unconditional and not based on any characteristic or action on the part of the person chosen.

In Christian theology, people are created good and in the image of God but have become corrupted by sin, which causes them to be imperfect and self-interested.[58] Reformed Christians, following the tradition of Augustine of Hippo, believe that this corruption of human nature was brought on by Adam and Eve's first sin, a doctrine called original sin. Reformed theologians emphasize that this sinfulness affects all of a person's nature, including their will. This view, that sin so dominates people that they are unable to avoid sin, has been called total depravity.[59] In colloquial English, the term "total depravity" can be easily misunderstood to mean that people are absent of any goodness or unable to do any good. However the Reformed teaching is actually that while people continue to bear God's image and may do things that are outwardly good, their sinful intentions affect all of their nature and actions so that they are not wholly pleasing to God.