Dark roast does have more caffeine per gram, because there are more beans per gram, because beans become lighter as roasting continues and more CO2 is released.
Counting caffeine per bean indeed darker roasts have less caffeine, but it’s a tiny tiny difference, so the effect of the whole bean getting lighter wins out when measuring caffeine per weight.
As for decaf, all methods affect taste. Swiss Water isn’t inherently better. Water is a chemical solvent. Is this an ad?
First Nations blessing is a bit of a gray area because they are not necessarily performed as a religious practice. Instead of a prayer, it’s interpreted (by those present) more like a First Nations representative formally acknowledging that the decisions about to be made are made with their participation.
It’s a cultural complexity that elders are often also seen as religious leaders and they’ll often speak in religious terms, but their blessing is foremost under the guise of a representative - not a cleric.
As for a regular Christian prayer… its sole purpose is a ritual for those in that religion.