Which changes how he expresses himself in the mortal realm. That is what he is for us. It is a very powerful being but in certain ways humanity is more powerfull. I specifically remember the white god. At the time I linked it to the radical changes in his character in history though that does not have to be the case. Human understanding changed.
Uriel's grace behaves like a mantle. If Michael had kept the mantle he would have become Uriel. It was not said with so many words but that is how it looked like.
Well that's been said of mantle bearers, it might not be true of the Almighty. We really haven't got much to go by, other than the power He gives His agents. And perhaps the power of His enemies - as excellent an indication as any.
But remember mortal understanding once placed Earth at the centre of the universe and the solar system etc. It also once posited that the Earth was flat - some fools still believe that today! I think humanity's power IS significant - but even in the Dresden Files humanity haven't lived longer than the universe. Which seems to me that the universe then has some fundamentals that no amount of understanding will affect. I don't think the Almighty's impact is limited the same way other supernatural's are. He holds the keys to the kingdom, He presumably can bypass the normal restrictions.
In any case, if you could pull up that WOJ or direct me to it as I am having a hard time tracking it down I would appreciate it.
Also, with regards to Uriel...I find it highly significant that his Grace acts rather like a Mantle. For two main reasons.
1) Grace is basically what makes an Angel an Angel. This is what Uriel said. BUT - not quite everything. He still had his identity, and seemingly his intellectus. Bob also has said that Angels are able to do what they do mostly via Soulfire. When Harry expresses surprise at this, wondering if Angels even have souls, Bob explains that they don't have much
else. Now Bob doesn't know everything and his view gets narrowed because of what he is. But if I had to guess, a soul is merely a word that covers a range of spiritual qualities and pieces. Many cultures such as the Egyptians believed that the soul had multiple parts. Angels and humans share certain parts of the soul, but not all. Angels get more power, but humans get some part that gives them total Free Will. Which is more useful is probably more based on perspective and context. I think Griffin or Serack covered the whole soul thing in a WAG a few years back.
2) If Uriel IS wearing a mantle, then what other mantles might he also be wearing? My personal WAG (and it is wild) is that each Archangel, and perhaps each Angel and even each Soul, might make up TWG in some variation. If you think of TWG as a superbeing (I would say superorganism but it really doesn't quite work), then His "body" is the universes, His "arms" and "legs" are the Angels, and the souls of us are part of His mind. The other part of course is the Archangels. That is how He is able to interact, He is literally doing it through lesser parts of Himself. And we know that He does this - He has sent himself as a Mortal into the world before, perhaps even several times. So we know He is capable of being partially in one form, but the greater part of his infinite power is retained elsewhere. My analogy might be rough, but I think the idea is clear. I have no basis for it in canon or otherwise...but I do wonder. It would go a long way to explaining how He is able to be omnipresent, omniscient and omnipotent. It also might indicate that part of himself rebelled though...which is also rather disturbing. But then again our bodies and minds rebel against ourselves all the time. Perhaps that's just a part of the natural order of things.
And my WAG best answers the Problem of Evil.