Regarding the voice beneath the maggots / bed of worms, I think it might be more figurative than literal, as in literally having maggots or worms above it. If it's below us or inside the Earth, it might anyway, but it could just mean below. Both words, maggot and worm, also refer to people quite often in a negative way, so it could be "festering underneath the human trash."
I believe the same for the whole 'more than one god in the dark' thing. In the dark can mean literal darkness, or uncertainty. Speaking of ad infinitum, I think this sums it up well:
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Pareidolia especially seems to fit into "something in between" (and uncertainty, hidden motives/true face)* rather than "the dark." He's not darkness, he's the rogue, emerging from between the others, coming from behind, something between light and dark. Unnoticed because he was behind the others at first, until he peaked his head over their shoulders, grew stronger, took control. Pareidolia (noun) itself requires light, some times a heavy absence of it, some times just the right amount to highlight the right features for us to think "human."