Random Toughts at the End of Reading Monsignor Quixote: It makes sense that these characters are Catholic. When your Catholic you can perform actions that are meritorious, or at least potentially of some value, so your doubts don't carry the same weight that they do when you are evangelical. Barth won't admit doubts as a legitimate part of faith. He says that faith is concerned with a decision once for all, and if you have doubts don't take then too seriously. Evangelicals can't suffer doubts, they aren’t allowed, they aren't part of human life. You have to feel a certain way that won't admit doubt. This is probably why it’s the catholic and orthodox who you generally find talking about doubt in any kind of legitimating way.
Sancho rightly observes that doubt makes action difficult but if part of faith is action then a man might act in faith from hope and at least a small level of trust. But if you are evangelical there are no acts of faith, you have to get your mind and heart under control. So any doubts are to be run from, hidden even from yourself, and de-legitimized as attacks of the devil. (The big bad devil.) Well maybe that is better. Better to come to the end of Christianity then to continue walking in a half-belief deceiving yourself, maintaining the faith through acts of trust.
And does it matter what acts one does? A good evangelical would say what matters is the hearts willingness. The faith, love and trust in God. Well, they might be right. The Psalms say the Lord does not despise those with humble and contrite hearts.