With one God and the concept that we are all His children, the idea of equality is assured of appearing.
Since all are equal, this allows and justifies the debased to rule in place of the competent.
The appearance of Akenaten, with his elongated head and arms, bloated belly, is the epitome of "botched and bungled". His wife and children are not pleasant to look at anymore than he is.
Once Akenaten is established on the throne of Egypt, his "priestly instincts" take over. He places himself between God and man. Akenaten becomes the intermediary and the priests of the other gods are now unemployed.
In the accepted chronology, Akenaten was uknown for over 2,000 years. However, if Akenaten died around 1400 AD, then there might me an occult oral tradition concerning him that Nietzsche may have heard. This is too much speculation for my taste, but I do like the substitution of "monotheism" for "Christianity" in Nietzsche's writings and putting in the context of Akenaten.
PS The year 1400 AD is not random.
Accepted year of Akenaten's death 1336 BC
The numbers that comprise the phantom chronology are 330-362, 720, 1053, 1386 and 1773-1840 per A. Fomenko.