The theorists of Tradition, such as Evola, Nasr, and Guenon, have all sorts of theories and hazy, lament-driven non-theories about why the modern era lost the sense of the sacred. A McKenna type of theory explains the true simple reason.
In the modern era, people stopped keeping their own cows in their yard, therefore they no longer had the ideal ur-entheogen, psilocybin/stropharia cubensis mushrooms, in their face all the time. No longer having cubensis mushrooms growing in their yard all the time, the moderns lost the entheogenic door to the sacred, and that's why they lost the sense of the sacred.
There are forever two alternative explanations: the official confusion and non-explanation, versus the absolutely simple and perfectly clear entheogen-based explanation. How is it that the Greeks clearly had intense mystic experiencing on tap?
The official explanation is none at all: "It's a complete mystery to us (and drugs are an inferior method to this proposed explanation or non-explanation). Also, the ancients were feeble-minded and superstitious and did a lot of drumming and wild dancing, and starved themselves and had very, very impressive rituals. And they practiced Zen meditation too."
The entheogen-based explanation is impossible to surpass in simplicity: they had intense mystic experiencing on tap, as did the mystically informed masses in the middle ages, due to ready-to-hand availability of cow-pie mushrooms and other visionary plants, readily present until the one oddly mystically ignorant and illiterate era, modernity, when man altogether moved out of nature, away from visionary plants, and into the city.
Suppose in an average region of Europe, a person has a cow in their yard. How many psychoactive mushrooms per year will result, in their yard?