Brent Lang Executive Editor “Sound of Freedom,” a faith-based film about child sex trafficking, is shaping up to be an unlikely box office hit. Angel Studios, the streaming and distribution company behind the low-budget drama, claims that the film has generated more than $10 million in pre-sales ahead of its theatrical release on July 4. That’s an impressive number for a movie that isn’t relying on a glossy big studio marketing campaign. It’s also another sign of the buying power of religious moviegoers, who helped propel this spring’s “Jesus Revolution” to an improbable $53 million at the global box despite the fact that the biggest star in that movie was Kelsey Grammar.