Over the past few years, we’ve been hearing rumblings of revival on college campuses. To chase down the story, Sarah Eekhoff Zylstra headed over to Iowa State University in Ames, Iowa, to see what was going on with the largest campus ministry you’ve never heard of—the Salt Company.

Salt Company does a lot of things you’d expect—large worship gatherings, small group Bible studies, and summer mission trips. But they also do some things you wouldn’t anticipate, such as talking about sin, taking kids through Wayne Grudem’s systematic theology (the abridged version), and requiring student leaders to be members of a local church.

In today’s sensitive, selfie-obsessed culture, you might wonder if discussions of sin or of robust theology would be a good on-ramp to Christianity. But over the last 40 years, Salt has grown to 12,000 students on 33 campuses (and churches!) in 16 states.

What is drawing the most anxious generation to the gospel?