Do you know that from another mortals POV a 'god' is any being with sufficient power to work miracles on a planetary scale? There really hasn't been any discussion in the series about what a "god" exactly is in the Dresdenverse. I think it's premature to paste a definition onto them before we know more. I mean, by your definition Satan is a god!
..yup
and your point is?
heck, according to abrahamic mythology, (s)he is. as are half his/her vassals.. the princes of hell are pagan gods of darkness who were thrown down by the 'true god' when they took over as lord of the earth. Set, Ammon, Belial, Asmodeus.. they were all gods once.
youre dealing with two issues here:
in the historical sense, a god is any being that large numbers of people worship or worshipped. Even Uriel recongizes this; he refers to the rampies as 'usurpers' that is people who are pretending to be gods; but doign so implies that the archangel considers the real mayan gods to be real gods.
which has some validity , note the classic 'worship no pother god before me' is essentially the same thing. The original abrahamic religion was polytheistic after all; and the darkness (satan) was very much a god of it.
for the abstract POV If a being shows up who can literaly juggle the himmalays and says its a god, im inclined to not argue too loudly.
Mab qualifies under both catagories.