Many Christians today fail to see the hidden dangers behind the man-centeredness of today’s so-called Evangelicalism and, therefore, may question the validity of exposing doctrinal error within the church. Benjamin B. Warfield was a warrior for truth in his day. Here is a great quote from this defender that reminds us that the greatest danger to the purity of the Gospel of Jesus Christ does not come from outside the professing church, but from within.
The chief dangers to Christianity do not come from the anti-Christian systems…It is the corrupt forms of Christianity itself which menace from time to time the life of Christianity. Why make much of minor points of difference between those who serve the one Christ? Because a pure gospel is worth preserving; and is not only worth preserving, but is logically (and logic will always work itself out in history) the only saving gospel.
(1894, Selected Shorter Writings-Vol. 2, Presbyterian & Reformed, 1973; as cited by Iain Murray in “Evangelicalism Divided”)