I think the take with the original interpretations of the Myriad Gods and Amaterasu in this case seems to be a kind of changed here. The girls for example, seem to represent different images of various other known powerful Gods in the myth. For example, the robot is clearly a personification of Susanoo in my opinion. As it was, I must say they constantly mention names of the 'Creator of the Gods' such as Ninigi-no-on-no-Mikoto, the one created from the Heavens, Hence, quite literally the creator of Amaterasu.
One must say, the interplay between 'duty' and 'where and I belong is not here' is really beautiful in this show, a show with this much play on depth and personality is hard to find this season so this makes up a lot for it.