my reading of Wake Up Dead Man is that Benoit Blanc's mother has recently died and his approach to the entire investigation is informed by this
when introducing himself to Father Jud, Blanc says "my mother is—was very religious" which is not a slip you make if your mother has been dead for a long time (compare to Knives Out where he says "my father was a police detective" with no hesitation)
his litany against Christianity in that same scene feels very personal, which could be for any number of reasons, but I think the line I mentioned in the previous bullet point is meant to provide context for it; he's expressing anger towards his mother and her loyalty to the church during her lifetime
similarly, when Blanc has his "road to Damascus" moment and his speech about giving grace to those who deserve it the least but need it the most, he's not really (or at least not only) talking about Martha; he's realized that he needs to find forgiveness and grace for his mother as well
Blanc's mother being dead would make him a thematic parallel to Monsignor Wicks, whose own unresolved trauma with his deceased mother informs his hyper-religious worldview (which stands in opposition to Blanc's hyper-rationalist one)
it also seems very intentional that when Father Jud prays for Louise, it's because her mother is dying and she doesn't want their last words exchanged to be in anger
I think I'm really onto something here
