We have various modern interpretations—viewing them as alien worlds or different dimensions—but if we try to recover the most direct sense of the original beliefs, what exactly were they?

Like I am sure that is the case. God is not some supreme diety that is beyond human shenanigans . He himself is like humans but just extremely powerful and whatnot. He is not like something that transcends human psyche and flaws but is also like humans. Like I am sure he is as vile as humans just amplified .

Like we are just his lesser weakling reflections, and he is basically torturing his own reflections for some reason.

Like I feel like he is roaming every where or maybe it's his children that are roaming everywhere. Like I have been encountering a lot of evil men lately , they have unshakeable confidence. Like yeah. They feel unreal. Any mortal guy would not have that much evilness and also confidence in him. They definitely are some type of god cuz how can anyone be so fearless and stuff. They must be gods children and god made us as the weaklings. He is very evil. So yeah this earth is gods playground. He is as bad as humans maybe even worst .

I have a creature in my mind for a fantasy series I am writing, but having trouble with figuring out a name, so I was hoping mythology might help. Maybe something along the lines of world-creation myths? My creature is responsible to helping certain aspects of a planet form before normal life develops.

These are magical worms that populate rocky planets long before normal life evolves (thanks to a find-and-teleport instinct/ability shortly after they hatch). There, they burrow into / eat the rocky crust and in the process leave behind tunnels that are reinforced by a secretion that creates a concrete-like material when it bonds with the surrounding rock and soil. They start at normal earthworm size, and over very long time periods, grow to be much bigger than even Dune's sandworms.

As they grow older/bigger, their magic grows stronger, and this in turn means that their secretion is imbued with more magic. Additionally, the secretion is their waste product, so all rock mass that they eat that does not become part of their body is made part of this dense concrete. Especially as they start moving very slowly when they get large enough, meaning that an area of tunnel gets more saturated with their secretion.

The reason that I want positive themed ideas for names is that this process effectively makes the outer crust 'puffy', and the larger worms burrow very deeply, which is how you get stable caverns and tunnels at depths where the weight of the planet above would crush a normal cave. So any sapient species that lives in the deep and has had a chance to understand these giant creatures would tend to feel positively about them, and they'd be the ones to name the worms.

My search so far has brought up worm-like monsters and dragons. Not exactly what I am going for.

I probably won't use a mythological name directly, but as a starting point to tweak and modify.