Christ promised that he’d build his church and that the gates of hell would not prevail against it. That promise doesn’t depend on demographic trends bending in our favor. It doesn’t require Gen Z to show up at higher rates than millennials do. It rests on the power and faithfulness of the One who made it.

Here are two headlines you might have seen recently. In September, Barna Group announced, “Young Adults Lead a Resurgence in Church Attendance,” with Gen Z and millennials attending more frequently than they did during the pandemic. Then, in November, Gallup reported, “Drop in U.S. Religiosity Among Largest in World,” with the percentage of Americans who say religion is important to their daily life falling 17 points over the past decade, from 66 percent in 2015 to just 49 percent today.

So which is it? Is Christianity in America experiencing a resurgence or a collapse?

The honest answer is that it depends on what you’re measuring, how you’re framing it, and which slice of the population you’re examining. The Barna data tracks young adults who already attend church and measures whether they’re coming more often. The Gallup data measures the broader population and whether religion matters to their daily lives. Both can be technically accurate while pointing in opposite directions. And yet American Christians are likely to remember only the one that matched their mood.

This is precisely the problem with watching religious trends. And it’s the reason, after two decades of writing about such trends, I’ve become hesitant to give them much weight. We evangelicals tend to get too enamored with religious trends, both the encouraging ones and the discouraging. We read too much into data that confirms our hopes or validates our fears.

There are at least three reasons we should hold these trends more loosely.

Trends Often Don’t Mean What We Think

Consider a seemingly unrelated example. If I asked you whether gun violence in America increased or decreased between 2002 and 2011, you might look at the gun-related homicide rate and conclude that things stayed roughly the same—about four deaths per 100,000 people throughout that decade.

But you’d be missing something important. A study published in the Journal of General Internal Medicine found that while gun homicide rates held steady, nonfatal violent gunshot injuries rose significantly—from about 13 per 100,000 in 2002 to 18 per 100,000 by 2011.

The reason the death rate didn’t keep pace with the rising violence was due almost solely to medical advances. Trauma care techniques developed on the battlefields of Iraq and Afghanistan (such as improved strategies to stop bleeding, better vascular repair, and advances in neurocritical care) were being used in civilian emergency rooms. Gunshot victims who would have died a decade earlier were now surviving.

The trend—a stable homicide rate—masked the reality of rising violence.

We see something similar in those religious surveys. Start with the optimistic one. The Barna “resurgence” describes young adults attending church an average of 1.8 to 1.9 times per month. That’s less than half of Sundays. And the increase is measured against pandemic lows, when many churches were literally closed. The word “resurgence” does a lot of work in that headline, and the framing shapes our perception more than the underlying numbers warrant.

But the pessimistic headline deserves the same scrutiny. That Gallup study showing a 17-point drop in religiosity is real, and it’s significant. But the same study notes that the United States remains more religious than most wealthy peer nations. The median for OECD countries is 36 percent; we’re at 49 percent. America is declining toward the norm for developed countries, not cratering below it. The “collapse” framing tells one story; the comparative data tells another.

This isn’t to say either dataset is meaningless. A genuine increase in young churchgoers is worth celebrating, and a significant decline in religious importance is worth taking seriously. Yet neither trend necessarily means what we instinctively think it means. And if we build our confidence—or our anxiety—on a misreading, we’re building on sand.

We Don’t Live in a Smooth World

National averages flatten out enormous regional, denominational, and demographic variation. What’s true in one part of the country, or in one church tradition, may be opposite elsewhere.

This creates a kind of observer bias. If your church is growing and full of young families, you might read the Barna study and think revival is breaking out across America. If your church is graying and shrinking, you might think the Gallup data is presenting a clearer picture of reality. Both responses make the same mistake of treating personal experience as normative.

The result is either unfounded triumphalism or unnecessary discouragement—and sometimes both, depending on which Christian circles you run in. I’ve seen pastors talk about church growth as if it’s simply a matter of getting the right strategy, and I’ve seen others express near despair, as if faithfulness itself has failed. Neither posture is warranted by the data, because the data is never as uniform as we imagine.

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