The Idiot
Fyodor Mikhailovich Dostoevsky
the holy fool whom God loves (ch. I of Part One), Rogozhin's question before the Holbein copy, whether the prince believes in God (ch. IV of Part Two), Lebedev's Wormwood star (ch. IV of Part Three), Hippolyte's question about how to believe in the resurrection before a corpse (ch. VI of Part Three), his refusal to praise what devours him (ch. VII of Part Three), the Christ that Nastasya would paint (ch. X of Part Three) and the speech against Catholicism (ch. VII of Part Four).
The Brothers Karamazov
Fyodor Mikhailovich Dostoevsky
the lady who doubts the life to come and hears that the proof is the experience of active love (chapter IV of Book II), the servant who, with the mountain, shows that no one truly has faith (chapter VII of Book III), Fyodor's question to his sons, whether God exists and whether there is immortality (chapter VIII of Book III), Ivan, who accepts God and refuses the world (chapter III of Book V), Alyosha, who tells Lise that perhaps he does not believe (chapter I of Book V), the smell in the coffin and the divided monastery (chapter I of Book VII), Alyosha, who does not rebel against God and does not accept His world (chapter II of Book VII), the visit to the soul at the wedding at Cana (chapter IV of Book VII), the devil who dreams of incarnating in a merchant's wife in order to light a candle (chapter IX of Book XI), Mitya, who asks the court not to deprive him of his God (chapter XIV of Book XII), and Kolya's question about the resurrection (chapter III of the Epilogue).
Paradise
Dante Alighieri
Dante's definition to Peter, substance of things hoped for and argument of things not seen (canto XXIV), hope as a certain expectation of future glory (canto XXV), the question about the man of the Indus (canto XIX), the salvation of Trajan and Rhipeus (canto XX), and the warning that many cry Christ and will be far less near him (canto XIX).