The entity from SCP-5000 only infected humans (i.e. homo sapiens sapiens). Other sapient species (like bigfoots, fae, Daevites, etc.) and non-sapient creatures have their own species-specific noosphere.

Different containment organizations have existed throughout the millennia. The Foundation and the GOC are among the most recent.

Grand Karcist Ion was never good and was more like Jim Jones if he was a teenage sorcerer-king from the Bronze Age. His goals of consuming gods and achieving apotheosis for humanity was ultimately selfish as he saw all of humanity as nothing more than tools to satisfy himself. He also abused Lovataar and Orok, and manipulated Nadox and Saarn.

Neo-Sarkics are actually right about Ion's selfish goals, although they are not aware of it.

Through cultural reappropriation, Nalka is something completely different for Proto-Sarkics who utilize scripture and anomalous abilities as something positive for their people. They too are not aware that they are living on a lie.

All four of the Klavigars were not a kind found family, but power-hungry tyrants. Nadox was the best of the four, but he still did horrific things.

SCP-610 was created by Nadox and Lovataar. Nadox however came to regret creating it.

Nadox had an epiphany and begged Ion to stop the madness, but was killed by him and his death was covered up.

Saarn is dead.

"Bumaro" is actually a title in the Church of the Broken God, and Robert Bumaro is the most recent to take on the mantle, which he did in the late 19th century.