Once ubiquitous in American theaters (and still quite healthy in Taylor Sheridan’s domain), big-screen Westerns are relatively scarce these days. When such tales do surface, however, they’re increasingly comingled with a genre that’s very much on the rise: horror. The latest such shotgun marriage, “ Killing Faith ,” is a somewhat murky and unsatisfying one. Still, its intriguing premise, able cast and bursts of violence hold attention even as writer-director Ned Crowley’s execution never quite realizes his concept’s potential. After a limited theatrical stint last month, Shout! Studios’ release is now available on demand.

An unspecified “great sickness” plagues the Arizona territory of 1849, felling humans and livestock alike. Apparently immune from it is a ranch inhabited by freed slav

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