Theology is never just an idea. Every theology eventually becomes behavior. Every pattern of behavior eventually bears fruit.

By Their Fruits: Testing Theology asks a simple question:
What if theology should be accountable for the lives it shapes?

Over the last seven articles, we’ve spent a lot of time making the case for why the fruit matters. We’ve talked about harm as evidence, what good fruit might actually look like, the difference between being right and doing right, and why the consequences of our theology need to be allowed to talk back to the theology itself.

Which raises a fairly obvious question:
Okay. How do we actually do that?

Because “judge a theology by its fruit” sounds great right up until somebody asks you to show your work.

Fair enough. Let’s show our work.

First, let's get something out of the way. Testing theology by its fruit does not mean deciding whether a theology makes us feel good.

Some things that are good for us are uncomfortable. Sometimes theology should challenge us. It should unsettle us, confront our privilege, call us out of selfishness, and occasionally make it difficult to keep pretending we're the center of the universe. If your theology never makes you uncomfortable, congratulations, you may have accidentally created a religion in your own image.

So discomfort isn't necessarily bad fruit. Neither is disagreement. And being offended by something certainly doesn't prove it wrong.

The question is what happens when a theology gets lived.

What does it teach people to believe about themselves and other people? What kinds of relationships does it create? What behaviors does it encourage, discourage, excuse, or condemn? Who gets to flourish under it? Who gets made smaller?

Those aren't distractions from doing theology.

They're part of doing theology.

This is where Behavioral Theology gets practical.

Take a theological claim and follow it.

Don't stop when you've figured out which Bible verses support it. Don't stop when you've found out how old the tradition is or which theologians agree with it. Scripture matters. Tradition matters. Reason matters. Experience matters. We've been saying that from the beginning.

But don't stop there.

Follow the theology out of the book and into the sanctuary. Follow it home. See what it does inside marriages and families. Pay attention to what happens when it reaches classrooms and voting booths. Watch what it teaches people about their bodies, their sexuality, their neighbors, their enemies, their worth, and their place in the world.

Then look around. That's where the fruit is.

And here's the tricky part: we can't only count the fruit we wanted the theology to produce. Intentions matter, but intentions aren't magic. They don't make consequences disappear.

At some point, we have to look at what actually grew.

This may be one of the most important questions Behavioral Theology can ask:
Who gets to testify about the fruit?

Because Christianity has developed a rather convenient habit of letting the people who create, teach, and defend a theology also be the ones who tell us whether it's working.

Funny how often they give themselves a passing grade. (Or maybe not so funny).

Imagine testing a new medication by asking only the pharmaceutical company whether patients experienced side effects. Or evaluating a workplace by interviewing only the CEO. We can see the problem with that immediately.

And yet churches do something remarkably similar all the time.

We want to know whether a theology is healthy, so we ask the theologians who defend it. We ask the pastors preaching it. We quote the authorities who have benefited from its authority.

Meanwhile, the people who actually had to live under it are standing right there.

Here’s a thought: Maybe we should ask them.

If we're going to judge the fruit, we probably ought to talk to the people who had to eat it.

Women have something important to tell us about the fruit of theology that says men should hold authority over them. LGBTQ+ people have something important to tell us about theology that declares their relationships sinful or their identities disordered. Black Christians have something important to tell us about theological traditions that somehow managed to coexist quite comfortably with slavery, segregation, and white supremacy. And people carrying religious trauma have something important to tell us about systems that insist the real problem was merely that somebody practiced perfectly good theology badly.

Their experiences don't automatically settle every theological question.

But they count.

More than that, they are evidence.

This is where theology has too often pulled a neat little trick. When the people most affected by a theology describe its harmful fruit, defenders of the theology suddenly become very interested in explaining why those people's experiences don't really tell us anything about the theology.

The theology remains safely on trial while half the witnesses are ruled inadmissible.

That's a hell of a way to run a trial.

Behavioral Theology insists we hear the witnesses.

There's another question worth asking whenever we test a theology:
Who benefits?

Not because benefiting from a theology automatically makes it wrong. That's too easy. But theology doesn't happen in some lovely little vacuum untouched by power. It happens in communities where some people have more authority, more security, more money, and considerably more ability to define what counts as “faithful” than others.

So follow the power.

If a theology consistently tells one group to submit while another group gets to lead, notice that. If it repeatedly asks people with less power to forgive while people with more power somehow keep avoiding accountability, notice that. If it teaches poor people to be content while wealthy people get to call their abundance a blessing, you might want to notice that too.

And if the people who benefit most from a theology are also the people insisting most loudly that questioning it is dangerous, well...

Maybe notice that one twice.

Power doesn't automatically invalidate theology. But when theology stops paying attention to power, it has a nasty habit of blessing whoever already has it.

None of this means one bad experience disproves an entire theological tradition.

People are messy.
Churches are messy.
Theology is certainly messy.

Any theology can be misused, misunderstood, or badly practiced. Behavioral Theology can't reach a verdict before looking carefully at the evidence and then pretend that's somehow better.

So we look for patterns.

Does the same kind of harm keep appearing? Does it show up in different churches, communities, or generations? Do people who have never met one another describe remarkably similar wounds? Does the theology repeatedly produce fear, shame, domination, exclusion, or dehumanization even while the people teaching it insist none of that was supposed to happen?

At some point, repetition matters.

After all, if you plant an apple tree and one apple comes out rotten, you probably don't cut down the tree. But if year after year that tree produces crates of rotten apples, eventually “there must be something wrong with the apples” starts sounding a little ridiculous.

Eventually, you have to look at the tree.

And then we get to the part that makes Behavioral Theology more than simply keeping a running list of consequences.

We let the fruit talk back.

If the evidence suggests that a theology is repeatedly producing harm, we return to the theology. We reopen the biblical interpretation. We reconsider the tradition. We question the assumptions underneath it. We ask whether the people who formulated it could see things we now see, whether power shaped conclusions we've treated as timeless, and whether something we've been calling sacred might actually need changing.

That's the feedback loop.

Theology shapes lives. Lives produce fruit. We examine the fruit.

And then the fruit gets to say something about the theology. Not the last word. Not the only word. But a real word.

Otherwise we're not testing theology at all. We're defending it and collecting testimonials from the people for whom it happened to work.

And here's where this gets uncomfortable.

For the fruit test to mean anything, we have to be genuinely willing to discover that something we believe is wrong.

Not poorly explained. 
Not unfortunately misunderstood. 
Not “taken out of context.”

Wrong.

Or maybe incomplete. Maybe distorted. Maybe shaped by assumptions we hadn't noticed. Maybe useful in one context and harmful in another. Maybe built around a question nobody is asking anymore.

That's a frightening possibility if faithfulness means protecting the theology we've inherited. But, it’s considerably less frightening if faithfulness means pursuing love, justice, mercy, and human flourishing wherever the evidence leads us.

Behavioral Theology doesn't begin by assuming our theology is guilty.

It simply refuses to assume it's innocent.

So when we're testing a theology, here are some of the questions worth carrying with us:
What kind of people does it produce?
What kind of communities does it create?
Who benefits?
Who is harmed?
Whose voices are being treated as evidence?
Whose voices are being ignored?
What patterns appear when the theology is lived over time?
When bad fruit appears, is the theology itself allowed to come back under examination?
Does it bear the fruit of love, justice, mercy, and human flourishing?

A theology that consistently harms people deserves to be questioned.
A theology that consistently helps people deserves our attention.

Pick one theological belief you were taught not to question.

Don't argue with it yet. And don't defend it either.

Just follow it.

See what that belief looks like once it leaves the page and enters people's lives. Ask who has benefited from it and who has carried its costs. Then do something Christianity hasn't always been particularly good at: listen to the people who have actually lived under it, especially the people theology has historically been very good at talking about while being considerably less interested in listening to.

Because if we're going to judge a theology by its fruit, we probably ought to talk to the people who had to eat it.