Christianity is based, then, upon an account of something that happened, and the Christian worker is primarily a witness. But, if so, it is rather important that the Christian worker should tell the truth. When a man takes his seat upon the witness stand, it makes little difference what the cut of his coat is or whether his sentences are nicely turned. The important thing is that he tell the truth, the whole truth, and nothing but the truth. If we are to be truly Christians, then, it does make a vast difference what our teachings are, and it is by no means aside from the point to set forth the teachings of Christianity in contrast with the teachings of the chief modern rival of Christianity.
The chief modern rival of Christianity is “liberalism.” An examination of the teachings of liberalism in comparison with those of Christianity will show that, at every point, the two movements are in direct opposition.
From: Christianity and Liberalism by J. Gresham Machen (New York: Macmillan, 1923), p. 53.