Back in March of 2018 I wrote a post called Atheism Is Not a Light Switch. The argument was simple: when somebody announces “I used to be an atheist,” the first question to ask is why they became one in the first place. Most of the time, when you hear the answer, you find there was never any disbelief there to lose. They were mad at God. They were mad at church people. They hit a crisis and “atheist” was the word they grabbed for how it felt. Then life changed, the feeling changed, and the label changed back. But atheism isn’t a light switch. You don’t flip it on in a bad year and off in a good one.

I got some pushback on that one. People said, oh yeah, really, that happens? Show me. So the very next day I wrote Why Do Some People Leave Atheism? and showed them. It wasn’t hard to find the examples: the crisis conversion, where a man found God at the lowest point of his life and called his season of despair “atheism”; the fellow who left in a huff because, in his telling, atheists are bullies. Worked examples, one after another, of labels changing a lot faster than beliefs ever did.

And the day before the light switch post, I had written the foundation for both of them: Atheism: A Conclusion, Not a Belief. That one was about my own arrival. There was no anger in it and no crisis. Nobody had wronged me. I just slowly stopped being able to reconcile what I was supposed to believe with what I could see was true, and at the end of that process I was an atheist. Not a decision I made one afternoon. A conclusion I arrived at, the way you arrive at the end of a long road. That trilogy of posts, three days in a row, is probably still the clearest statement of where I stand on this.

Now, in fairness, let me say plainly what I was aiming at back then, because it matters for what’s coming. My target was the testimony business. The “ex-atheist” is a stock character in apologetics — the worse the before, the better the story, and the story gets told and retold precisely because it sounds like a trophy. I was auditing the trophy, not every individual human being who ever changed his mind. Hold onto that, because here’s the turn I didn’t take in 2018.

Christians say the same thing I said. Word for word, almost. Let a prominent Christian walk away from the faith and within days you will hear it: “He was never really a Christian.” “She never truly believed.” It’s the mirror image of my argument, pointed the other direction — and it’s not just something random believers say in comment sections. It has a whole doctrine underneath it.

The doctrine is called eternal security, or the perseverance of the saints: once God truly saves a person, God keeps that person saved, and it cannot be undone. If that’s true, then “saved and lost it” is a contradiction — it cannot happen, ever. Which means every visible departure has to be reclassified. The faith was never real in the first place. The flagship text is 1 John 2:19: “They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us.” Behind it stands a whole wall of verses: John 10, where no one can snatch the sheep out of the Father’s hand; Romans 8, where the chain from foreknown to glorified never breaks; Philippians 1:6, where he who began a good work completes it; and Matthew 7:23, where Jesus tells the false professors, “I never knew you” — never, not “I knew you once and then you left.” And there’s Judas, who walked with Jesus for three years and, on this reading, was never his at all.

Nor is this some fringe idea. It’s written into the Baptist Faith and Message, the Southern Baptist confession: “All true believers endure to the end… will never fall away from the state of grace.” GotQuestions, about as mainstream-evangelical as it gets, says eternal security “guarantees their salvation as eternally secure.” R.C. Sproul spent a career asking of anyone who finally fell away whether they were ever truly believers in the first place. John Piper, John MacArthur — the biggest names in that world all make some version of the same move. And to state their case fairly, the strong version of it: this is a claim about God, not a sneer at the people leaving. If God’s keeping can fail, their whole doctrine fails, so the exceptions simply must be reclassified. Even John Calvin conceded the awkward part. He admitted the non-elect can have a “temporary faith” so much like the real thing that, in his words, “even in their own judgment there is no difference between them.” Think about that. The tradition itself admits the man who left may have experienced something indistinguishable from genuine faith — including to the man himself.

There’s a catch built into the argument, though, and it’s a convenient one. The only way to know the faith wasn’t real is that the person left and didn’t come back. If he comes back, he was merely backsliding, and his faith was real all along. If he stays gone until he dies — ah, then he was never saved. The verdict can only be delivered after the story is over, which makes it impossible to ever be wrong in the meantime. We saw it delivered in public in 2019, when Joshua Harris — a megachurch pastor, the author of I Kissed Dating Goodbye, about as credentialed a Christian as the modern church produces — announced he was no longer a Christian. Albert Mohler responded within days: a Christian cannot become a non-Christian, so if Harris doesn’t return to the faith, he was a “pretend believer” all along. The label depends on the ending. That’s not an observation; that’s a conclusion with a lifetime to wait for its evidence.

But before anybody on my side gets too comfortable laughing at this, here’s the part of the story that I find genuinely interesting: about half of Christianity never signed on to any of it, and they’ve been arguing with the other half about it for five hundred years. The Arminians and Wesleyans hold that salvation is a covenant a person can actually walk out of. Their statement of faith says it flatly: “persevering in faith is necessary for final salvation.” Roger Olson, one of their theologians, answers John 10 with a marriage analogy: yes, no one can snatch you out of God’s hand — but a husband can’t be snatched out of a marriage either, and he can still walk out of one. Catholics never had once-saved-always-saved at all: in their teaching, mortal sin “destroys charity in the heart” and loses sanctifying grace. The grace was real, the baptism was real, and the loss is real too — that’s what confession and restoration are for. And the Arminian and Catholic side has its own wall of texts, starting with Hebrews 6, which describes people who were enlightened, who tasted the heavenly gift, who “shared in the Holy Spirit” — and then fell away. Or Galatians 5:4, which speaks of people “fallen away from grace.” Fallen from what, if they were never up there?

Each side reads its own passages plainly and explains the other side’s passages away. That’s the deadlock, and it’s been running since the Reformation. So the accurate sentence isn’t “Christians say you were never really a Christian.” It’s “Christians with a doctrine to protect say it” — and other Christians, lots of them, think it’s wrong and always have. Why does the insider fight matter more than my opinion? Because it proves the “never really” claim isn’t something the evidence forces on you. People reading the same Bible, in the same faith, reach the opposite conclusion. The claim is a choice the doctrine makes, not a fact the leaver’s life establishes.

Then there are the people the argument actually lands on, and their answer is a résumé. “I was there. I believed.” Prayed, wept, witnessed, tithed, led the small group, planted the church, went to seminary. Harris himself said it best: “By all the measurements that I have for defining a Christian, I am not a Christian” — present measurements, honestly taken, about a past he isn’t denying. A few weeks after Harris, Hillsong songwriter Marty Sampson announced he was “genuinely losing my faith,” and his follow-up is worth noticing: not a clean break, but “shaky ground.” A slide. Dan Barker preached for nineteen years before he stopped believing. And then there’s the Clergy Project, an organization that exists for one reason: hundreds of pastors — hundreds — stopped believing while standing in pulpits, people with every earthly incentive to stay, who fought the loss for years before they admitted it even to themselves. The researchers who studied clergy who lost their faith found the same shape every time: doubt first, then silence, then a slow process measured in years.

There’s a name for the argumentative move itself, and it comes from the atheist side of the aisle: Antony Flew called it the No True Scotsman fallacy — when a counterexample shows up, redefine the term so the counterexample doesn’t count. But the ex-believers have their own word for what it feels like from underneath, and I think their word is better. They call it erasure. “You were sincere. You believed deeply.” To be told by your old tribe that none of it ever happened — that your prayers, your tears, your years were a performance you didn’t even know you were giving — isn’t just a debating loss. It’s the deletion of a chunk of your own life. The argument is still being fought in its current round: a 2024 book, The Deconstruction of Christianity, argues most of the people now “deconstructing” their faith were never truly converted in the first place, and the reviews keep answering with the same résumé — missionaries, pastors, worship leaders, home group leaders. Weren’t real believers? That’s convenient.

So what does the record actually show? Pew’s latest Religious Landscape Study found that 35 percent of American adults — about 90 million people — no longer identify with the religion they were raised in, and 21.9 percent of all adults are former Christians specifically. For every person Christianity gains by conversion, it loses about six. The “never really” verdict is currently being pronounced over a third of the country, which should make anybody suspicious of it: a theory of fake faith that has to cover 90 million cases is a theory under strain. And look at how people actually leave, per Pew’s December 2025 report on why Americans leave their religion: the top reasons are slow accumulations — “I can be moral without religion” (78 percent), “I question a lot of religious teachings” (64 percent), distrust of institutions and leaders. Not lightning bolts. Not rebellions. The clergy studies found the same thing, and, frankly, so did my own reading of the “ex-atheist” stories in 2018: real belief change, in either direction, almost never happens like a switch being flipped. It happens like a dimmer being turned. The sudden, dramatic, overnight story — the Damascus road in one direction, the crisis conversion in the other — is the exception, and it’s the one to audit.

There’s a cross-check from my side of the door, too, and it makes me a little more confident in the dimmer. In 2007, 21 percent of self-described atheists told Pew they believed in God or a universal spirit. By the 2023-24 study, that was down to 7 percent. The label “atheist” has been getting more honest over time — fewer people wearing it who don’t mean it — and I don’t doubt the same cleanup has been happening on the Christian side, as the cultural pressure to wear that label fades. Labels are getting more accurate on both sides of the door because the people wearing them halfway are leaving both tribes.

Now let me put the two sentences next to each other, because that’s the whole post:

“You were never really an atheist.”

“You were never really a Christian.”

Same grammar. Same function. In both cases, the tribe’s story about itself — nobody who really gets it ever leaves it — survives the person who left. I wrote one of those sentences for years, in effect if not in so many words, and they write the other one. If I hold them to a standard, I have to stand under it myself, so here’s my honest verdict on my own 2018 argument. What survives: audit the sudden stories, in both directions, because belief doesn’t usually move that fast and testimonies get polished. What I’d soften: the blanket “never really.” I was auditing résumés without noticing that the other tribe audits résumés too, and reaches its verdict the same way — by deciding in advance.

But the symmetry isn’t perfect, and if I pretend it is, this post is a cheap shot. Three real differences. First, the stakes differ: their claim pronounces on a man’s eternal soul and retroactively voids his baptism; mine only discounted the sales value of a testimony. Second, their claim is forced — their doctrine cannot afford one single genuine case, so it can never be revised; mine was a rule of thumb, and a rule of thumb can be dropped the day a real case beats it. Third, the leavers themselves differ: the “ex-atheists” I wrote about mostly treated atheism as a mood they passed through, while the ex-Christians describe an identity they lived inside for decades. The dimmer turns at different speeds for different people, but it almost never jumps.

So here’s the standard I’d propose, for both tribes, mine included. Judge the testimony by the life that was lived under the label at the time, not by the label worn now. If he lived it as real — prayed like it was real, sacrificed like it was real, organized his whole life around it like it was real — then it was real, and his leaving is a fact to be explained, not a fact to be deleted. By that standard, Dan Barker was a Christian and so was Joshua Harris. And by that same standard, some of the “ex-atheists” I wrote about in 2018 were never atheists at all, because there was never a conclusion there — just a grievance with a label on it. I’m willing to say both halves of that sentence. I’d be interested to know if the other side is willing to say theirs.

The 2018 post got a lot of readers, and I think the core of it was right: nobody’s deepest convictions flip like a light switch. I just didn’t see, then, that the same was true on the other side of the church door — and that my argument and theirs were the same argument, wearing different jerseys. So here’s the question I’d leave with both tribes. If a real one leaving doesn’t look like this — the slow doubts, the years of fighting it, the grief when it finally goes — then tell me: what would it look like?