It's quite possible that the low reviews for this series are influenced by its religious themes. Yet the producers must have been aware of the risk. Religion can be a polarizing subject. Any misstep-real or perceived-could lead to backlash.
However, I see the religious elements as metaphors, similar to how the shark in Jaws represented more than just a predator. This series, like Jaws, is ultimately about human experience. Themes of fear, guilt, redemption, and existential questioning resonate on multiple levels. When viewed this way, the characters' struggles feel more real and profound.
I give the series a 6.5 not only for the engaging characters, but also for the courage shown by the series creators.