The film does explore her Catholic faith in an depth manner.

www.beataproductions.com
Uncommon Grace: The Life of Flannery O'Connor
"This film traces the people and events that shaped her remarkable career, as well as the important role that Catholicism played in her writing. Featuring expert commentary and rare photographs, Uncommon Grace will give you a new appreciation for this highly celebrated, yet often misunderstood, storyteller. "
https://www.amazon.com/Uncommon-Grace-Life-Flannery-OConnor/dp/B018HEW22Y