While not Sci-Fi, I found that The Screwtape Letters could actually be enjoyed even from a fairly agnostic perspective, as an allegorical dive into human cognit

While not Sci-Fi, I found that The Screwtape Letters could actually be enjoyed even from a fairly agnostic perspective, as an allegorical dive into human cognitive foibles. Though I suspect Lewis would be unhappy to hear that, especially since he wrote a fourth-wall-adjacent bit about devils preferring that humans don't believe in them.