Making the gospel optional

It was good to see this link (found at Tim Challies' blog) this morning: https://www.proclaimanddefend.org/2025/10/23/a-dangerous-new-ecumenism/

Recently there's been a spate of Internet noise from people - who self-describe as evangelical Protestants - giving their opinion that the golden age of Christianity in the world was the medieval period. One supposedly Reformed evangelical publisher emailed out advertisements for a book on Christopher Columbus, breathlessly explaining that "we had been lied to" because we didn't know that Columbus' ultimate motive was to finance a new Crusade to free the "Holy Land" from "the Moslem hordes"..... and this was being presented, without any hint of irony or embarrassment, as a good thing. Many voices declare that the time has come to put aside our differences, and not merely co-operate with sufficiently like-minded people to achieve limited societal aims (such as combating abortion or the promotion of sexual depravity), but to together build a "Christian society" together with those who preach what our confessions of faith say are false gospels which corrupt the fundamentals of Christian faith.

All this is to say: there are a lot of siren voices telling us that, in effect, the gospel is optional. It can be your own private belief: good for you. But outside the privacy of your own thoughts, the Christian faith must be reduced to only the profession that there is one God in three persons, and that salvation has something to do with your preferred version of Jesus. The minimal "Christianity" in this new ecumenism will include the being of God and the fact that the gospel saves, but as to what the gospel is, that is something you can choose for yourself. In the public sphere, Christianity is to be a large tent which includes both saving biblical truth and its denial.

It is never explained why this should be. If we can edit the gospel, then why not the Trinity too? If it does not matter whether salvation is by grace alone, through faith alone, or whether it is progressively mediated through the sacerdotal ministry of a official priesthood of the church, then why does it matter if someone is a Binitarian instead of a Trinitarian? That is to say: if the boundaries of what is "Christian" are being extended to include this heresy, then why not that heresy? Why does the meaning of Christianity change when moving in between the church sanctuary and the public square?

In effect, the idea seems to be that as long as we have official, outward Christianity, then it doesn't actually matter if we have genuine spiritual life or not. Which is again to say: the gospel is optional.

But the gospel is not optional: it is everything. We may well co-operate with people who are not Christians on various projects in this world, because we are members of this present age as well as the age to come. But to re-define what is meant by "Christian" in order to accomplish this, is not something the Master has given us freedom to do, and nor should we want to. The gospel is not negotiable, for whatever purpose. Our duty is to pass it on faithfully. If some political purpose requires us to soft-pedal essentials of the gospel or to treat them as optional, then we must sacrifice that political purpose. This is not a choice: this is what being a genuine follower of Jesus who told us to take up the cross implies.