Two related answers:
1) Deliberately religious productions generally set out with the primary goal of getting a religious message across, rather than of creating a piece of entertainment or a work of art. The latter goal is secondary and slapped on, and often fails due to lack of talent or lack of focus on this as an important goal. This is completely avoidable, but it requires the talent and focus that go always are required when creating a piece of entertainment or a work of art.
2) Good film, television, music, etc. often relies on subtlety and ambiguity. Deliberately religious works tend to throw these out the window, and smack the consumer in the face with an overt message that is very black and white with little ambiguity. This is also avoidable, but again requires both talent and focus.
I remember an artist in the old Soviet Union complaining about being required to make all her art somehow depict a principle of Communism. She paraphrased Freud: "Sometimes a painting of a flower is just a painting of a flower."
But it's certainly not impossible to convey a specific and identifiable message in a good work of art. What I see wrong in these religious productions is more basic than that: Stale writing and wooden performances.
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