Madame Bovary
Gustave Flaubert
faith as sensation in Part I - The Ball as Poison, the church that does not listen in Part II, chs. 1-8 - The Show and the Seduction, and the duel of quotations at the wake in Chapter 9 of Part III.
Dom Casmurro
Machado de Assis
the vow of Dona Glória (chapter XI), the thousand Paternosters and a thousand Hail Marys (chapter XX), the vocation that comes with habit (chapter XLI), the ordained orphan in place of the son (chapter XCVI).