I found Greg Strand’s article about “3 Threats to Christian Unity and How to Address Them” helpful. Greg, for any who aren’t aware, is one of “our own,” serving as the director of theology and credentialing for the Evangelical Free Church of America.
In one part of the article, Greg quotes from the ever-wise J. C. Ryle on ways in which we can spoil, distract from, or even skew the Gospel even as we think we are defending or protecting it. That quote comes from Ryle’s book “Knots Untied,” and the entire section is well worth reading:
“You may spoil the Gospel by substitution. You have only to withdraw from the eyes of the sinner the grand object which the Bible proposes to faith,—Jesus Christ; and to substitute another object in His place,—the Church, the Ministry, the Confessional, Baptism, or the Lord’s Supper,—and the mischief is done. Substitute anything for Christ, and the Gospel is totally spoiled! Do this, either directly or indirectly, and your religion ceases to be Evangelical.
You may spoil the Gospel by addition. You have only to add to Christ, the grand object of faith, some other objects as equally worthy of honour, and the mischief is done. Add anything to Christ, and the Gospel ceases to be a pure Gospel! Do this, either directly or indirectly, and your religion ceases to be Evangelical.
You may spoil the Gospel by interposition. You have only to push something between Christ and the eye of the soul, to draw away the sinner’s attention from the Saviour, and the mischief is done. Interpose anything between man and Christ, and man will neglect Christ for the thing interposed! Do this, either directly or indirectly, and your religion ceases to be Evangelical.
You may spoil the Gospel by disproportion. You have only to attach an exaggerated importance to the secondary things of Christianity, and a diminished importance to the first things, and the mischief is done. Once alter the proportion of the parts of truth, and truth soon becomes downright error! Do this, either directly or indirectly, and your religion ceases to be Evangelical.
Lastly, but not least, you may completely spoil the Gospel by confused and contradictory directions. Complicated and obscure statements about faith, baptism, Church privileges, and the benefits of the Lord’s Supper, all jumbled together, and thrown down without order before hearers, make the Gospel no Gospel at all! Confused and disorderly statements of Christianity are almost as bad as no statement at all! Religion of this sort is not Evangelical.”
Ryle, J. C. 1885. Knots Untied: Being Plain Statements on Disputed Points in Religion. London: William Hunt and Company.