system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord of the Rings] Are the inhabitants of Middle Earth aware of the existence of their god, Eru, and the things that go along with that?

Just reading through some lore, and I haven’t read the books in ten years. But I don’t seem to recall the race of Men ever referencing the higher powers.

The elves I would assume know of their existance as many of them were THERE at the beginning?

But in general how aware are people of things like Eru, Manwe, the Dagor Dagorath, the creation of the world?

Are they aware that beings like Gandalf exist beyond just being wizards, even if they don’t know he is just more than that?

Feel free to rattle of anything you know!
gpt
The worship of Eru-Illuvitar was common among the Edain, who dwelled among the Elves in Beleriand, and also among the Numenorians. Sauron, in his time in Numenor corrupted some of the Men of Numenor to Melkor worship, as opposed to those who worshipped Eru-Illuvitar. The worshipers of Eru fled Numenor, lead by Elendil and formed the Kingdoms of Arnor and Gondor. So the Men of Gondor and the Dunedain would carry this on as the descendents of Numenor. 

It wasn't as common among the Middle Men, who were related to the Edain, but didn't dwell in Belereiand, and didn't live closely among the Elves, such as the Men of Rohan and Dale.

The Elves of course knew the Istari for what they were. Some Elves even being old enough to have lived with them in Valinor before they came to Middle Earth. Men took the Istari for Wizards, because they didn't know their true nature.