

why is there no one with the authority to deem him unfit to govern, and demand that he step down under duress of consequences?
There is, it’s called impeachment followed by a vote to remove. That vote can’t pass without Republicans joining in, and they likely won’t.
The sub-flavors are important. Jainism, Wicca, Asatru, Evangelical, Catholic, etc… all have different world views, expectations etc… some are fairly benign, others are not.