Well, nobody said that the designers are treating the topic with any kind of systematic thought behind it. Especially since Dark Heresy and BC/OW were not written by the same studio.
But, for better or worse, this game has space magic, and in Dark Heresy the description of Righteous Fury associates this perk with the Emperor himself. Personally, I would just dismiss this as superstition (just like I dismiss Acts of Faith as such, in my preferred version of the setting), but I thought it deserves to be mentioned so that everyone can make this decision for themselves.
It could influence a GM's decision as to why RF should be cancelled or not, after all.
current 40k RPG character: Aura Vashaan
, Astromancer Witch-Priestess
previous characters: Captain Elias (Celestial Lions Chapter -- debriefed), Comrade-Trooper Dasha Malenko
(1207th Valhallan Ice Warriors -- KIA), Sister Elana
(Order of the Sacred Rose -- assassinated), Leftenant Darion Baylesworth (Rogue Trader Artemisia -- retired), Taleera "Raven" Nephran (Hive Ganger & Inquisitorial Assassin -- mindwiped)