The Unexpected Evangelism Tool No One Told You About

My most embarrassing moment in ministry didn't happen from a pulpit.

It happened at a dinner table in 2019, when a doctoral student in neuroscience — someone I'd been praying for for two years — finally asked me directly: "Okay. Explain to me why you actually believe this."

I had spent years in seminary. I had a PhD in computer science. I had read the apologists. And I sat there, chopsticks in hand, and fumbled through the most incoherent three minutes of my professional life.

She nodded politely. Changed the subject. The moment passed.

I've thought about that dinner table many times since. Last year, I finally found something that would have helped me prepare for it — and it came from the same technology I spend my days researching.

What Practicing With AI Actually Looks Like

The concept is simple enough that it almost sounds too obvious.

Before you have the real conversation — with your skeptical colleague, your atheist roommate, your ex-evangelical sibling — you have a practice conversation with AI first.

You instruct it to play the role of the person you're trying to reach. You tell it not to go easy on you. You find out where your reasoning actually breaks down before those gaps show up in a relationship with real stakes.

Here's the setup that works:

"Play the role of a 34-year-old software engineer who left Christianity in college after studying evolutionary biology. You consider yourself a secular humanist. You're willing to talk about faith but you find most Christian arguments circular. Don't accept vague answers. If I dodge, call it out."

Then talk. Actually talk — or type — the way you would in a real conversation.

What you discover in the first ten minutes will surprise you.

What 30 Days of This Taught Me

I ran this experiment with five different personas over thirty days — a Buddhist colleague, a progressive ex-evangelical, a committed atheist, a nominal Christian who "believes in something," and a Muslim friend I've known for years.

Three things became clear very quickly.

First, I was much weaker on the problem of evil than I thought. I had the standard responses memorized. When AI pushed back on each one systematically — not rudely, just persistently — I ran out of road faster than I expected.

Second, my tendency to quote Scripture in evangelism conversations is a bigger obstacle than I realized. When the AI simply responded "you're using your source to validate your source," I had no clean answer ready. Fair. I needed to rebuild that part of the conversation from scratch.

Third, and most unexpectedly, the exercise surfaced how much of my "evangelism" was actually monologue dressed up as dialogue. I was delivering content. I wasn't actually listening. AI, which has no feelings to hurt, showed me this without mercy.

The Ceiling You Need to Know

Here is what this tool cannot do, and it matters.

AI can surface the gaps in your argument. It cannot tell you what the Holy Spirit wants you to say in a specific moment with a specific person. It can simulate objections. It cannot replicate the years of relationship that make a single sentence land differently. It can make you more articulate. It cannot make you more loving.

When researchers evaluated AI on faith-related questions — sin, forgiveness, grace — the average score across models was 48 out of 100. God was referred to as a "higher power" and prayer as "mindfulness." Deseret News AI flattens theology to its least offensive form. Use it to sharpen your thinking. Don't use it as your theological reference.

The goal of evangelism was never to win an argument. The preparation, though? That's fair game.

How to Start Tonight

Open any AI tool. Type this exact prompt:

"I want to practice sharing my Christian faith. Play the role of a skeptical but respectful [atheist / agnostic / Buddhist — pick one]. Challenge my reasoning. Don't let me off the hook with vague answers. Start by asking me why I believe Christianity is true."

Then answer honestly.

Whatever stumps you — that's your homework for the week.

1 Peter 3:15 says to always be prepared to give a reason for the hope you have. It doesn't say the preparation has to happen in a vacuum.

References:

"How AI Is Quietly Rewiring Your Soul — Without You Ever Noticing", Apr 06, 2026, Crossmap

"4 in 10 Christians Say AI Has Helped Them with Bible Study, Prayer", Mar 02, 2026, Crosswalk