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What do Evangelicals have that we (Progressive, Mainliners) don't have—other than larger churches, larger seminaries, bigger attendance on Sunday, more serious engagement with Scripture, and enough passion for their faith to keep David Platt's Radical on the best seller list for 55 weeks running?

We can sniff and comfort ourselves with pride, if we want to do that. But I am sure that was pretty much where the crew of the Titanic lived just before the ice water began to roll in over their feet.

Don't get me wrong. This isn't a size thing. But we can only console ourselves for so long by arguing, "small is beautiful" or "we are too sophisticated to be popular." "Large" may not mean "good," but "small" is not necessarily a synonym for "virtuous" either. Sometimes, small just means "not all that interesting."

The question is also prompted by the tenor and level of engagement that Evangelicalism inspires. To get just a taste of it, read the obituary in last week's New York Times describing the life of John R. W. Stott who died on July 27.

There's another problem with dismissing Evangelicals out of hand: Many of the excuses we tell ourselves are based on a caricature that simply isn't fair or particularly accurate. Evangelicalism has its problems, but the ones it does have rarely receive attention and a lot of the criticisms laid at its doorstep are simply not true. Evangelicals are often bright, well educated, and comfortably middle class. They are not necessarily literalists or inerrantists. And contrary to the old stereotype, they do not hold the monolithic positions on social issues that some suppose.

So, it's time to ask, "What do they have?" Here's what I think explains the popularity of Evangelicalism:

Evangelicals believe something. To name a few things: They believe in God, the Trinity, the humanity and divinity of Jesus Christ, the Resurrection, and the authority of Scripture. These things define reality in a particular way for Evangelicals.

People are drawn to defining experiences. They ground and center life, they define the boundaries of a community, they lend cohesion to that community, and the shared language serves as the basis for a common life. What a community believes gives people a reason for becoming a part of it and reasons for staying.

There are many good reasons to practice humility about the claims that we make for our faith—not the least of which is our inability to capture everything that might be said about God. But a commitment to nothing in particular as a life's endeavor is finally unsatisfying. It doesn't make for social cohesion. And, at the same time, it is grounded in at least one dogma of its own—in spite of itself—i.e., the conviction that we can't know anything. Fair enough if you are a skeptic, but hardly a powerful reason for going to church.

Evangelicals are actively committed to what they believe. Both the Old and New Testaments connect what is known about God with living for God. The Book of Deuteronomy admonishes Israel to "Teach your children the Law and to do it." The Epistle of James picks up on the same theme: "Faith without works is dead." And Paul connects the facts of the faith with imperatives in his letters. To embrace truth, it must be lived.