CS Lewis was a theologian.
Have you read Lumen Gentium #s 14-16?
Have you read Von Balthasar’s work?
Dare We Hope That All Men Be Saved?: With a Short Discourse on Hell – 2nd Edition https://www.amazon.com/dp/158617942X/ref=cm_sw_r_cp_api_glt_fabc_N78G94TC8FEDQTFXPFM8
It is an excellent read on this topic.
That’s exactly the main message of Jesus! He came to save the world. Jesus literally says that many times.
This is a deep question and I have to reiterate, read Von Balthasar. His treatment of this question is excellent.
Dare We Hope That All Men Be Saved?: With a Short Discourse on Hell – 2nd Edition https://www.amazon.com/dp/158617942X/ref=cm_sw_r_cp_api_glt_fabc_KZ7B795XY19VC42Q9F5N
That’s my understanding of damnation and I think there’s a very good case to be made that that is the most orthodox understanding of the question.
I think Von Balthasar had the best text in this issue.
Dare We Hope That All Men Be Saved?: With a Short Discourse on Hell – 2nd Edition https://www.amazon.com/dp/158617942X/ref=cm_sw_r_cp_api_glt_fabc_J9KTMXWM5469GQQZTA49
There are some metaphorical references in the Bible. Here are some discussions of the topic. I also suggest you check out that first video I linked.
https://www.amazon.com/Dare-Hope-That-All-Saved/dp/158617942X/ref=nodl_
Here is the book that details out a Catholic Theory of (mostly) Universal Salvation.
https://www.catholic.com/magazine/online-edition/is-purgatory-in-the-bible
Here is a website that gives an overview of Purgatory.
Sure, I highly recommend: Dare We Hope? by Hans Urs van Balthasar.
We have literally no idea what the failure rate is. Some theologians, like Hans Urs von Balthasar say there are no human persons in hell at all. Pope Benedict and Pope John Paul II were both big fans of his.
His book is Dare We Hope All Men Be saved
https://www.amazon.com/Dare-Hope-That-All-Saved/dp/158617942X
or download an e-book copy here