As a Christian myself, I found this the most fiercely challenging part of the story. Being horribly martyred is one thing, but watching others suffer because you won't recant? No easy answers there.
I thought the Martin Scorsese film was great too. My review is here if you're interested (it's on my blog): https://simondillonbooks.wordpress.com/2017/01/04/film-review-silence/