system
Given the following post, respond as if you're commenting on Reddit:
human
[Moonknight] Mark is told that there are many astral plains and the implication is that you go to the plain associated with how you worship. Where would atheists go?
gpt
This is extremely complicated tbh.

The egyptian gods don't have (atleast on earth) a major base of believers. There is nothing that implies that you need to be a believer in the ancient Egyptian ideology to go to the field of reeds. In fact, the opposite is (almost) implied. Since we see people Mark and Steven, and the people Mark murdered trapped in the sand.

The one from Black panther might be reserved for Wakandan royality by Bastet (which is also an egyptian god).

Other than that, it's hard to say. We've never been shown anything of Valhall or any proof that it's real. The norse gods also seem to be very different from the egyptian ones. As they are just really advanced aliens, while the egyptian ones seem to be more in line with actual gods.

So from the two accounts we have seen of the afterlife in the MCU, it's really hard to say. Especially since we don't know if the entire ordeal was real. There is a very real possibility that the entire episode was an illusion of some kind. That the gods were testing Mark. The episode felt very ambiguous.