The Church muddled up the invocation of saints!

[Berengar]

@Fafnir

@One Shot

@Fafnir

Then again, as written the sentence in "The Benefits of Devotion" makes little sense

Read it as an introduction to the chapter, and its next phrase: obviously, Devotion makes characters

@"TC p.13 [i

The Benefits of Devotion[/i]"]likely to call upon more saints with greater success, because of their established relationships with those saints.

Right. So, create any character who lacks truly exceptional piety -- anyone with a Pious score of 4 or less.
E.g. create a grog with the Minor Personality Flaw "Pious" -- a notable Pious personality score of 3. So the grog's devoted to 3 saints.
Explain to me how he is "likely to call upon more saints with greater success" than a character without any devotion to a particular saint.

That pious grog is inclined to spend a few otherwise free seasons Gaining Devotion Points (TC p.14). Have him do so, and you will see the difference.

@Fafnir

@One Shot

@Fafnir

(which to me would make sense: I can't simply take a calendar and pray in turn to each saint there hoping that a random one of them will help me!)

Nobody would do this, of course, because it (a) doesn't help by the rules, as only

@"RoP:TD p.87 [i

Invoking a Saint[/i] (underscore mine)"]Once a day you may ask a saint for aid, hoping the saint will respond with a miracle.

Uhm... so you say, that I can't ask in a given day for a miracle to saint Peter, and for another miracle to saint Paul?

Precisely. Think about: "Once a week you may borrow a book from this library."

Cheers