Before we begin to analyze this practice of "testifying" in the light of the Scripture, let me say at the outset that I absolutely love hearing the stories of how people came to saving faith. I find it terribly thrilling and encouraging. In fact, my favorite Christian radio program ever is one that we heard routinely when we lived in Idaho, but sadly have not been able to find again since. It was called "Unshackled," and the concept was to create radio theater, complete with actors and sound effects, to dramatize real-life conversion stories.
I find that each conversion story from a genuine believer is like a fingerprint that says, "God has been here." Conversion stories (done rightly, as we'll discuss below) are like snowflakes. At one time, they are uniquely individual, and yet they share enough in common that they are all unified in kind. Each snowflake differs from snowflake, but they're all easily recognizable as snowflakes. There are common elements that demand we group them together.
What gets me thinking about Testimony Night specifically these days is the sad, nay, frankly depressing, story of Ergun Caner, the former President of Liberty University, a Southern Baptist seminary that has enjoyed something like celebrity status since its founding by the late Moral Majority honcho, Dr. Jerry Falwell. I will not go into details of the story here, but any internet search will make these available to you instantly.
Why would a man do this, invent this sort of story? I think the answer is pretty easy. Within the Christian world, an exciting conversion story can take you places, if that's what you want. It can sell books, and get you invited to speak at conferences all over the place. It can even get you employed as the President of a seminary, in spite of the fact that you may demonstrate merely the most tenuous grasp on Bible doctrine.
But we do this. We, Christians, who enjoy Testimony Night and find conversion stories rightly thrilling and inspiring. We set this environment in place. We make it possible, and even easy, for a charlatan to come up with a piece of pulse-pounding fiction and get fame and fortune for his trouble.
Now, having said all of that, I repeat: I love hearing conversion stories!
But here is where we have gone wrong. We have lost sight of the true miracle it is, when God turns the heart of any sinner to repent of their sins and trust in Him. That's become commonplace and frankly boring to us. And the reason for that, demands a whole 'nother post; but, it hinges on the Evangelical obsession with the lie of Decisional Regeneration. We have dumbed down the Gospel so much, and found so many ways to manipulate and steer our listeners, that getting people to make a decision for Jesus is no miracle at all. Deciding for Christ is no longer a case of a rebellious, poisonous God-hating heart being miraculously raised to new life: it's about convincing this rebel that he can have Jesus (or, really, all the benefits of Jesus) without inconvenient things like genuine repentance getting in the way; and, having raised his hand during the Revival Meeting, may walk out of said meeting completely unchanged, and yet completely assured of a glorious eternal life in heaven.
"Getting saved" has become an anti-climactic event in many Evangelical circles, therefore. So we look for something more, something that still has the power to thrill and entertain us. Satanic High Priest, you say? Wow! That's great! Childhood victim of Ritual Satanic Abuse? Marvelous! Mafia enforcer? Cool! Former Presidential cabinet member, privvy to the inner workings of government? Nice. Islamic radical bent on destroying America! Well, praise God!
We see this sort of thing on a smaller scale in our own, local Testimony Nights. Hopefully no one's making things up, of course, but still, you find many Christians who are convinced their testimony is too boring to share with anyone. They were pretty normal before Jesus saved them. Or, they were even a goody-two-shoes. How lame!
We have come to despise the miracle of being Born Again through the sovereign grace of God in Christ.

