Everyone has an opinion about why Millennials are leaving the church. It’s a controversial topic, one that Barna Group’s researchers have been examining for a decade.Yet whatever one’s personal view of the reasons behind Millennials staying or going, one thing is clear: the relationship between Millennials and the Church is shifting. Barna Group’s researchers have been examining Millennials’ faith development since the generation was in its teen years—that is, for about a decade.And while Barna Group’s research has previously highlighted what’s not working to keep Millennials at church, the research also illuminates what is working—and what churches can do to engage these young adults.