I was working on the message above but missed some kind of time limit. Here's the message I tried to send:
Well, I take it that today's literary circles would usually (with the exception of the racism) be fairly close to Lovecraft in thinking that reality is to be understood in materialist terms; but Dostoevsky would hold that the most important aspects of reality elude the scientific method (applied naturalism) and that materialism, while it can seem compelling, misses out.
Look up
The Brothers Karamazov where there's dialog between the older, sensual brother Mitya and his younger brother Ivan, who has identified with materialism. Dostoevsky gives to Ivan a very strong (I almost wrote "compelling," but in the context of the book it is not, finally, compelling) statement of atheism, which, I suppose, would be the view of most literary authors today.* See also the passage in which Mitya's been talking to a disaffected seminarist, Rakitin (who, as I recall, is something of a disciple of Ivan's).
This source says Dostoevsky hit the nail on the head as regards "neuroessentialism," which I take it was Lovecraft's view and is close to the view of lots of literary folk today:
https://neuroethicscanada.wordpress.com/2011/07/04/dostoevsky-prescient-neuroessentialist/
I take it that most literary folk today who have thought about philosophical and religious matters would pretty much go along with Ivan's classic exposition of atheism, which seems to have three basic points:
1.No supernaturalism is needed to explain the world, and supernaturalism often gets in the way of perceiving reality.
2.The horrendous sufferings of the innocent, such as small children, make the notion of a benign deity not only intellectually hard to sustain but just even disgusting.
3.The chicanery done in the name of religion is enormous.
You'll get most of this in Book V of
The Brothers Karamazov, which includes the famous Grand Inquisitor sequence, often reprinted as a stand-alone thing (!), which I think would have gratified Dostoevsky's authorial vanity, but which deprives it of the context of the entire book, which is an answer to it. The whole book is the context for the commenter's "reality vs. delusion" that you picked up on.
I think Dostoevsky might say that, till one seizes or perhaps rather has been seized by reality in his sense, one had better act in terms of familiar rules regarding what is right and not doing what is wrong, of choosing good vs. evil. I think I get what the commenter meant about Dostoevsky focusing on reality vs. delusion, but what he meant was something very different from what most literary circles would mean.
*Some might describe themselves as agnostics, but I think agnosticism is often little else than the atheism of people who don't want to be bothered to work out the details; they just want to do what they want to do.