As a writer myself, and someone who watches horror movies on the regular, I've seen plenty of Religious Horror, and a majority of them are fairly identical on some front: "The Repent & Pray Trope". Grave Torture, despite its pulling from Islamic beliefs, suffers from the same pitfalls.
The film is, at best, middling in quality. It has very little to do with the Religious themes in the movie, though I didn't care for it, personally. The acting is done well, and the gore and tension in certain scenes are decent; however, the overall plot is meandering, bloated, and subpar.
CONTENT WARNINGS:
> Gore
> Violence
> Implied/Confirmed SA of a Minor
> Bombings
> On Screen Suicide
> Death
> Corpses
> Claustrophobia
> Religious Trauma
> Child Death
> On-Screen Violent Deaths
> Violence Against Women
> Taphophobia (being buried alive)
> Depictions of Torture
If you're comfortable sitting through those warnings, then give it a watch. You may enjoy it as a slow-burn religious horror film. I didn't much care for it and at just shy of 2hrs it's a bit of a chore to get through. But, I invite you to form your own opinions of the film.