Short answers, pulled from the story.
Kemetism, also called Kemeticism or Kemetic paganism, is a neopagan religion that revives the ancient Egyptian religion. It emerged during the 1970s and encompasses a range of approaches from reconstructionist to syncretic to monotheistic.
Kemet means "black land" in ancient Egyptian, referring to the fertile dark mud deposited by the Nile during its annual floods. It is the endonym, or self-name, that ancient Egyptians used for their country.
Maat is the central principle of Kemetism, meaning order. Ancient Egyptians believed that observing maat ensured the stability of the world, and its failure would lead to chaos and the demise of existence. Even the pharaoh was primarily responsible for upholding maat.
The Ausar Auset Society was founded in 1973 by Ra Un Nefer Amen. It is based in Brooklyn, New York, and functions as a Pan-African spiritual organization that uses ancient Egyptian aesthetics as the basis of its religion.
Kemetic Orthodoxy, founded in the 1980s under current leader Tamara Siuda, aims to follow Egyptian traditions as closely as possible and is led by someone carrying pharaonic titles. It is also distinctive for practicing monolatry as official doctrine rather than full polytheism.
The last functional Egyptian temple, dedicated to the goddess Isis on the island of Philae, was closed by Emperor Justinian around 535 CE. This closure, following the prohibition of Paganism by Emperor Theodosius I in 392 CE, created a gap of over fourteen centuries before the Kemetic revival of the 1970s.