J.L. Aronson’s documentary on Daniel Smith and his siblings, who perform as the alt-rock Christian band the Danielson Famile, offers no juicy exposés of cultish faith or dysfunctional family dynamics, and nonfans may be put off by its relative lack of dramatic tension and soft-focus analog video, which paints the Smiths’ childhood, adolescence, and musical career in a sort of rosy-holy light. But the live footage, the weave of personal and professional history (marriages, births, tours), the observations from nonrelatives who’ve played in the band (especially Chris Palladino and Sufjan Stevens), the assorted tidbits (animated sequences, remarks about faith and rock from Steve Albini, of all people), and the commentary from delighted, frightened, or puzzled audience members supply a context for Daniel Smith’s religious odyssey that makes even his terrifying falsetto seem reasonable. 105 min.