• I am as firmly convinced that religions do harm as I am that they are untrue. The harm that is done by a religion is of two sorts, the one depending on the kind of belief which it is thought ought to be given to it, and the other upon the particular tenets believed. As regards the kind of belief: it is thought virtuous to have Faith—that is to say, to have a conviction which cannot be shaken by contrary evidence. Or, if contrary evidence might induce doubt, it is held that contrary evidence must be suppressed. On such grounds, the young are not allowed to hear arguments…. The consequence is that the minds of the young are stunted and are filled with fanatical hostility both to those who have other fanaticisms and, even more virulently, to those who object to all fanaticisms. ~ Bertrand Russell

Bertrand Russell, Why I Am Not a Christian: And Other Essays on Religion and Related Subjects (New York, NY; Simon and Schuster, 1957), vi.

(See response to Russell’s “induce doubt” portion at bottom)

Personal saving faith, in the way Scripture understands it, involves more than mere knowledge. Of course it is necessary that we have some knowledge of who Christ is and what he has done, for “how are they to believe in him of whom they have never heard?” (Rom. 10:14). But knowledge about the facts of Jesus’ life, death, and resurrection for us is not enough, for people can know facts but rebel against them or dislike them. (Rom. 1:32; James 2:19)….

In addition to knowledge of the facts of the gospel and approval of those facts, in order to be saved, I must decide to depend on Jesus to save me. In doing this I move from being an interested observer of the facts of salvation and the teachings of the Bible to being someone who enters into a new relationship with Jesus Christ as a living person. We may therefore define saving faith in the following way: Saving faith is trust in Jesus Christ as a living person for forgiveness of sins and for eternal lift with God.

This definition emphasizes that saving faith is not just a belief in facts but personal trust in Jesus to save me…. The unbeliever comes to Christ seeking to have sin and guilt removed and to enter into a genuine relationship with God that will last forever.

The definition emphasizes personal trust in Christ, not just belief in facts about Christ. Because saving faith in Scripture involves this personal trust, the word “trust” is a better word to use in contemporary culture than the word “faith” or “belief.” The reason is that we can “believe” something to be true with no personal commitment or dependence involved in it. I can believe that Canberra is the capital of Australia, or that 7 times 6 is 42, but have no personal commitment or dependence on anyone when I simply believe those facts. The word faith, on the other hand, is sometimes used today to refer to an almost irrational commitment to something in spite of strong evidence to the contrary, a sort of irrational decision to believe something that we are quite sure is not true! (If your favorite football team continues to lose games, someone might encourage you to “have faith” even though all the facts point the opposite direction.) In these two popular senses, the word “belief” and the word “faith” have a meaning contrary to the biblical sense.

The word trust is closer to the biblical idea, since we are familiar with trusting persons in everyday life. The more we come to know a person, and the more we see in that person a pattern of life that warrants trust, the more we find ourselves able to place trust in that person to do what he or she promises, or to act in ways that we can rely on. This fuller sense of personal trust is indicated in several passages of Scripture in which initial saving faith is spoken of in very personal terms, often using analogies drawn from personal relationships. John says, “To all who received him, who believed in his name, he gave power to become children of God” (John 1:12). Much as we would receive a guest into our homes, John speaks of receiving Christ.

John 3:16 tells us that “whoever believes in him should not perish but have eternal life.” Here John uses a surprising phrase when he does not simply say, “whoever believes him” (that is, believes that what he says is true and able to be trusted), but rather, “whoever believes in him.” The Greek phrase pisteuo eis auton could also be translated “believe into him” with the sense of trust or confidence that goes into and rests in Jesus as a person. Leon Morris can say, “Faith, for John, is an activity which takes men right out of themselves and makes them one with Christ.” He understands the Greek phrase pisteuo eis to be a significant indication that New Testament faith is not just intellectual assent but includes a “moral element of personal trust.” Such an expression was rare or perhaps nonexistent in the secular Greek found outside the New Testament, but it was well suited to express the personal trust in Christ that is involved in saving faith.

Wayne Grudem, Systematic Theology: An Introduction To Biblical Doctrine (Grand Rapids, MI: Zondervan, 2000), 709-711.