The practice of a religion such as Christianity is normally said to involve faith. But different theologians give different account of faith--some say it is simply a belief that God exists, other say it is trust in God. In this third and final volume of his trilogy on philosophical theology, Swinburne analyzes the purposes for practicing a religion--the attainment of salvation for oneself and the rendering of due worship and obedience to God--and concludes that both trust and belief are necessary for religious faith, but that the belief involved is a fairly weak kind--the belief that a certain creed is more likely than others to be true.