Well Osiris always has been a bit of a religious figure, considering he has an entire [i]cult[/i]. So the symbology here is appropriate. As for Destiny as a whole, religious belief and faith have always been a core of the game's story. The very premise of Destiny, of "Light vs Darkness" is just a reflection of the conception of "Good vs Evil" in say like the Bible. I mean just think about D1 for a bit here. Your character gets brought into a world he doesn't understand, and is drafted into a war he knows nothing about. You're meant to assume the Traveller is good. You're meant to have [i]faith[/i]. Sticking with D1, even your enemies are religious in a sense. The Vex could not understand the Darkness, or the Black Garden in more specific terms. Even they, which practically existed outside of time, couldn't fathom what the Darkness was, what it's goals were. So they turned to worship it. The Hive's very description in the grimoire describes their war against the Light as more of a "crusade". A holy war. And I mean, I think it's fair to call the Speaker the "holy prophet" of the Destiny universe. So in closing, it's not accurate to say Destiny isn't a place for religious ideas to manifest themselves. The Destiny universe is [i]built[/i] on concepts of religion, after all.