Amyraldism (sometimes Amyraldianism) is also known as the School of Saumur, post redemptionism,moderate Calvinism,four-point Calvinism, or hypothetical universalism (though it is in fact one of several hypothetical universalist systems).
It is the belief that God decreed Christ's atonement, prior to his decree of election, for all alike if they believe, but he then elected those whom he will bring to faith in Christ, seeing that none would believe on their own, and thereby preserving the Calvinist doctrine of unconditional election. The efficacy of the atonement remains limited to those who believe.
This doctrine is named after its formulator Moses Amyraut, and is still viewed as a variety of Calvinism in that it maintains the particularity of sovereign grace in the application of the atonement. However, detractors such as B. B. Warfield have termed it "an inconsistent and therefore unstable form of Calvinism."
Hypothetical universalist teachings may be found in the writings of early Reformed theologians including Heinrich Bullinger, Wolfgang Musculus, Zacharias Ursinus, and Girolamo Zanchi. Several theologians who signed the Canons of Dort were hypothetical universalists.
Moses Amyraut, originally a lawyer, but converted to the study of theology by the reading of Calvin's 'Institutes', an able divine and voluminous writer, developed the doctrine of hypothetical or conditional universalism, for which his teacher, John Cameron (1580–1625), a Scot, and for two years Headmaster of Saumur Academy, had prepared the way. His object was not to set aside but to moderate Calvinism by ingrafting this doctrine upon the particularism of election, and thereby to fortify it against the objections of Roman Catholics, by whom the French Protestants, or Huguenots, were surrounded and threatened. Being employed by the Reformed Synod in important diplomatic negotiations with the government, he came in frequent contact with bishops, and with Cardinal Richelieu, who esteemed him highly. His system is an approach, not so much to Arminianism, which he decidedly rejected, as to Lutheranism, which likewise teaches a universal atonement and a limited election.