It’s been fascinating to watch the rise, and evolution, of the faith-based movie over the years, and director Jon Erwin has been a part of that. He’s carved out a niche for himself, collaborating with his brother Andrew and focusing on true stories with a musical element, including “I Still Believe,” about Christian music star Jeremy Camp, and “I Can Only Imagine,” about the band MercyMe. The Erwin brothers also co-directed the documentary “The Jesus Music,” which has a direct tie to his latest narrative feature film, “Jesus Revolution,” which focuses on the same topic, the Jesus movement that took place in Southern California in the late ‘60s and early ‘70s.