User blog comment:Theory of everything/Grimm Speculations Part Four: Mythologies and Revelations/@comment-2255188-20120517052728/@comment-1966944-20120518014529

I've never speculated that Grimm is trying to preach either Christian or any other religious values at their audience. Writers are consciously or subconsciously influenced by a variety of texts in their storytelling and myth building. Many religious texts from many cultures over history have told of a common person visited by some "messenger angel" bringing tiddings from some otherworldly source that instructs the commoner that they must sacrifice for the greater good by spreading either a gospel and/or fighting an evil let loose upon the world.

Nick is an atypical "religious' figure in that he had lived a "normal" life up until his "messenger angel" arrived in the guise of Aunt Marie and told him he was "special" i.e. "chosen" to oppose an evil represented by various Wesen. Nick has powers beyond normal humans and indeed may be half human/half something else as one or both of his parents possibly had these powers.

As for Nick and Juliette's cohabitation going against Catholic and Christian teachings so thus the show is not trying bring a religious message may be true (although how many sef-professed believers consistantly follow their religious dogma is up for further debate) but one could argue that because of their cohabitation, they are being punished for their "sins". After all, I don't think being a Grimm is necessarily a "blessing" but more of a "curse" as Nick, ever since discovering he is a Grimm, has had to deceive and lie to his co-workers, family, and friends, all the while placing them in danger by just being in close proximity to them. He has also lost a chance at a more normal life when Juliette turned down his marriage proposal because of that deceit.

Back to its developing mythology, Grimm of course, has already used Grimm's Fairy Tales, Aesop's Fables, and Japanese folklore (with a touch of John Steinbeck thrown in) as a basis for most of their stories. Now they are closely tracing European history before and during World War Two to develop a background for the Wesen conflict and I think it wasn't a coincidence that a copy of The Rise and Fall of the Roman Empire was being read by Monroe but possibly a clue as to how the writers may parallel that historical documentation in the developing plotline.

So it would also not be out of the question for them to use many other sources (including religious) to develop these stories.