I'm not sure what it wanted to be: a critique of religion, or a murder mystery.
If it meant to be the former, then it's an awkward mix of tropes cobbled together by secular types ignorant of the fath they hรขte.
If it's the latter, then, to be polite, it's a bit of a slow burner.
If the anti religion stuff doesn't stoke the fires of the bias you probably deny you have, you'll have problems getting through this.