Agreed. Abstract means that people who followed other faiths can continue to worship their faith while attending this church. A list feels exclusive and makes one's prior beliefs unwelcome.
I'd rather say that any room for personal opinions or philosophy is what has created splits.
The biggest religions in the real world are monotheistic and have an answer for nearly any philosophical question.
But i agree on the saints, that there shouldn't be a list with the 'real' saints.
It would perhaps be more fun and logical to have different saints in different parts of beluaterra and the freedom for people to worship there own saints.