Why isn't it likely people would learn about religion according to my definition? Why do you think it has to lean towards "spiritual knowledge"?
If a person is pursuing learning about this sort of thing, it is usually because there is a Spiritual hunger. This does seem to vary according to age, with younger people being both more receptive and more impressionable.
This type of environment (at any age) is conducive to "spiritual knowledge." Now it is time to address the fact that I think
most world religions are going to lead you to the One True G-d, or at least bring you closer. So then the danger only comes with things like satanism, blood sacrifice, cannibalism -
OR, counterfeit via unholy spirit. Interesting point: the Judeo-Christian G-d identifies 12 different characteristics, only 9 of which the adversary has any counterfeit for. The 3 that cannot be faked (because neither unholy spirits nor holy Angels can comprehend it) are forgiveness, resurrection, and ... struggling to summarize the concept, Blessing. (Perhaps in the sense of mortal man being exalted as Prophet, King and Priest?)
So I will say that
anyone, of any faith or no faith, acting in said manner, is doing so in concert with the Holy Spirit. Fulfilling what Isaiah said in his 12 chapter, "drawing water from the wells of Salvation."
I use this to demonstrate that what I have defined as "Spiritual knowledge" is not so uncommon or inaccessible.