Q, by your estimate, that incorporates all of the best information you have, how long ago did the human race 'fall asleep'?
Are we talking around the 1800s with the 'normalization' of militant atheism (German idealist philosophers, e.g. Kant, Hegel, Marx (even though Marx denied it he was one), etc?
Or was it during the middle ages with the Reformation and split of religions into many more factions?
Or was it before then, 4th century era, with Constantine's 'forced' narrative of Christianity away from its roots?
Or did it occur during Jesus' life?
Before?
In other words, at what point in the past would you and your sources say that most of humanity was 'united'?