The gospel isn’t just an entry point. It’s the foundation we build on, the fuel we draw from, and the anchor that holds us fast. The moment a church assumes it, marginalizes it, or replaces it is the moment that church begins to drift. A church that forgets the gospel may still exist on paper; but it will wither spiritually.

Now I would remind you, brothers, of the gospel I preached to you, which you received, in which you stand, and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain. For I delivered to you as of first importance what I also received…
—1 Corinthians 15:1-3

The church in Corinth had massive issues. Division, disorder, doctrinal confusion, and moral compromise just to name a few. And yet, under all those surface-level issues, Paul identified one root cause: they had taken their eyes off the gospel.

That’s why he wrote 1 Corinthians—to call the church back to the foundation. Paul wasn’t introducing new techniques or trendy strategies. He was reminding them of the message they had received, the one they stood on, and the only one that could save them.

Because when a church forgets the gospel, everything begins to unravel.

Paul’s words in 1 Corinthians 15:1-3 help us see five marks of what must be guarded, and what starts to fall apart when the gospel is no longer our focus.

When the Gospel Is Assumed

Paul begins 1 Corinthians 15 with these words: “I would remind you…” That phrase should stop us in our tracks. He’s speaking to Christians, to church members, and to believers who already know the gospel. But he reminds them anyway.

Why? Because assuming the gospel is the first step toward losing it.

Paul doesn’t launch into a new teaching—he repeats the foundational one. Christ died for our sins, was buried, and rose again, just as the Scriptures foretold (vv. 3–4). This is the message of first importance.

Churches often drift not because they deny the gospel, but because they assume it. It becomes background noise rather than the soundtrack. They get preoccupied with programs, strategies, or social impact—and slowly, the core message fades.

But if the gospel isn’t the main thing, everything else will fall apart.

When the Gospel Is Replaced

Paul says that the gospel was something he “delivered” to the Corinthians (v. 3). It wasn’t his invention. It wasn’t open for revision. It was entrusted to him by God, and his job was to faithfully proclaim it.

That’s our job, too.

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