I’m not 100% sure, but you could try Brandon Sanderson’s “Skyward” and other books/stories in what’s apparently called “Cytoverse” series. I didn’t read them yet, that’s why no promises, but I’ve read his “Cosmere” books - those are not really sci-fi though, more fantasy/steampunk (depending on sub-series) - and I found a lot of Christian themes in there. To the extent that I sincerely found some to be helpful for my faith development (even if I’m of a different denomination). I wouldn’t be surprised if he put some such themes in his other books too.
As for CS Lewis, I had no idea he has any sci-fi books - I’ll have to find them now! He’s definitively a very Christian topics writer.
I’m not 100% sure, but you could try Brandon Sanderson’s “Skyward” and other books/stories in what’s apparently called “Cytoverse” series. I didn’t read them yet, that’s why no promises, but I’ve read his “Cosmere” books - those are not really sci-fi though, more fantasy/steampunk (depending on sub-series) - and I found a lot of Christian themes in there. To the extent that I sincerely found some to be helpful for my faith development (even if I’m of a different denomination). I wouldn’t be surprised if he put some such themes in his other books too.
As for CS Lewis, I had no idea he has any sci-fi books - I’ll have to find them now! He’s definitively a very Christian topics writer.