Maybe, but the whole imperial mandate is still kind of predicated on the notion of a covenant with Akatosh, and Aka is so tied up with the iconography and history of the empire, up to and including when Tiber Septim, himself deified, founded the modern empire, that I can't see why this might be a sort of lapsed title. They might be less zealous now, but less religious?
And it's not like it's in the least unusual; the Roman Emperors, touched by semi-divine glory, were also high priests to the state religion, holding the title of pontifex maximus, the same title assumed later by the Catholic pope. I expected one of the excitable wiki-wuving boffins to jump at the opportunity to point out that particular piece of trivia. They have let me down.
That just highlights the fact that Popes claim a solely religious authority of 'the One God'.
In Tamriel it is the Nine Divines". Even with Akatosh senior each God/Goddess is worshipped separately ... for separate purposes.
You would have to go back to pre-Christian days to find a pantheon in Rome ...
Yet the Roman Emperors started calling themselves Gods as a result of conversion to Christianity such as it was then and that was blasphemy on their part.
etc ...