system
Given the following post, respond as if you're commenting on Reddit:
human
[Middle Earth] How would the history of Middle Earth change if Eru had completely detached himself from Arda the moment after its creation.

In this timeline, he would not perform any kind of intervention, direct or indirect. He would be completely silent, not communicating anything to anyone, not even the Valar. All he would do is silently watch the events of the world take place. How would history change?
gpt
That's basically what he did. Eru only intervened twice in the history of Arda. Once to sink Númenor and remove the Undying Lands and once to destroy the One Ring. 

So it really wouldn't change too much history-wise. If Eru didn't interfere well the Numenoreans land on Valinor only to get crushed by the might of the Valar and 3 Elven nations. The resulting battle shakes the world and sinks Numenor anyway. The only difference is that instead of slinking away, Sauron gets captured and tossed out the void with Melkor. Magic fades and the elves leave because that's inevitable. 

The only difference is that the world is still flat and the Undying Lands are still on Arda which raises the possibility that Men can still find Valinor.