Originally Posted by 2ndwind
....The Screwtape Letters. It's a satire written as a correspondence between a head demon and his minion assigned to keep a human "patient" from Salvation and when that fails to rob him of as much joy and contentment as possible.

I found an annotated version free online here..... I first read this 45 years ago.... I still think about it fairly often.....

https://allnovel.net/the-screwtape-letters.html
Great book, even better website. I see the have Lewis' "Mere Christianity" and "The Problem of Pain". Both great works, but "The Problem of Pain" is especially good for those who rebel and are yet powerless to change their human condition.
As an aside, Chritianity is one of the few religious philosophies that does not promise to eliminate suffering.

https://allnovel.net/mere-christianity.html

https://allnovel.net/the-problem-of-pain.html

Politics is War by Other Means