Reformed theology came out of the Reformation and in particular the theology of John Calvin (1509-1564), although its roots go back to Augustine (345-430), it was formulated by the puritans, especially in the Westminster confession of faith (1646). This Confession is the enduring fruit of the solemn Assembly of some 100 leading Puritan divines, convened at Westminster Abbey in London from July 1, 1643 through to Feb.,1649. Other reformed confessions: Belgic (1580), Baptist (1689), 39 Articles of the Church of England – Anglican and Episcopal (1571, 1662, 1801)
Reformed theology emphasizes God rather than man being centered (Arminian). God chose us rather than we chose God, only those chosen by God will come to him and those who come to him he will not be cast out. Reformed theology is sometimes called covenant theology being based on the covenants of redemption (within the trinity), works (made with Adam) and grace (made with sinners). The idea of unconditional election means that there is nothing within us, even in God’s foreknowledge of us that moved Him to elect us. His choice of election was based on His good pleasure and wisdom and not on anything good or bad in us i.e. it is not conditional on us, hence our election is unconditional. Reformed theology places regeneration before faith. The perseverance of the saints or preservation of the saints effectively means once saved always saved.