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I agree with this, and kicked myself a little for forgetting...but at the same time this brought questions...how much and what kind of artistic license do you think we have? I know there are obvious no-nos, but what are your thoughts on this subject (artistic license in fantasy)?
Do you think that Tolkien's version of angels, etc. was using a little too much artistic license?
Artistic Liberty - Since we are writers, we create. So that is within our artistic license. Storytelling is a gift that God has given us, and we should definitely use it for His glory. 
Keeping that in mind, whatever does not bring Him glory, or introduces something that could be confusing or contradictory to what He has said should be avoided. Magic needs to be treated with care and clear distinctions as to what it is and as to what it is not. I understand that some writers may say that while magic is forbidden and bad in this world, that it does not have to be in other worlds. This may be true, but the same could be applied to murder. 
I do believe there are ways to portray magic that is not necessarily portraying magic in the same sense as it is on earth.So, basically, if it goes against what we know to be moral in the Bible - don't do it. If it could be confusing, treat it with care. And by confusion, I don't mean what may cause confusion with debatable theology between denominations (end times, baptism, women's roles, etc.), but rather what Christianity clearly is.
So we have liberty, and I believe we have a lot of it. There really is a lot of freedom that God gives us when He allows us to create things. It's really great. But there are certain things that need to be approached with care, and some things that should not be approached at all.
Angels/Nephilim - As far as angels and nephilim, the area is more grey because the Bible does not focus very much on angels, so we are only given little descriptions of what they are, how they interact, their characters, etc. And the subject of nephilim seems to be a debatable one on earth, so there definitely is artistic license here. However, this is the beginning of subjects where treading with a little bit of care is needed. I don't think too much power should be given, and I think there needs to be a distinct separation between them and humanity and them and God.
Tolkien - From reading the Silmarillion, I would say that this is an example of someone who is treading on very, very thin ice. I personally believe he goes too far with his angel equivalents. It seems to me that the people of the world call too much upon the Valar, rather than just Eru Ilúvatar. They appear more like deities than angels in this respect, which I am not fond of. However, I can understand the reasoning behind this artistic license - I just don't necessarily agree with it. And otherwise, I do like the allegory in his books.