The way was opened, according to the Bible, by an act of God, when, almost nineteen hundred years ago, outside the walls of Jerusalem, the eternal Son was offered as a sacrifice for the sins of men. To that one great event the whole Old Testament looks forward, and in that one event the whole of the New Testament finds its centre and core. Salvation then, according to the Bible, is not something that was discovered, but something that happened. Hence appears the uniqueness of the Bible. All the ideas of Christianity might be discovered in some other religion, yet there would be in that other religion no Christianity. For Christianity depends, not upon a complex of ideas, but upon the narration of an event. Without that event, the world, in the Christian view, is altogether dark, and humanity is lost under the guilt of sin. There can be no salvation by the discovery of eternal truth, for eternal truth brings naught but despair, because of sin. But a new face has been put upon life by the blessed thing that God did when He offered up His only begotten Son.

Machen, J. G. (2009). Christianity and Liberalism (New Edition, p. 60). Grand Rapids, MI; Cambridge, U.K.: William B. Eerdmans Publishing Company.