Disembodied spiritual beings are today and have been in the past seen by all cultures.
Disembodied spiritual beings have never been seen at any time by anyone; indeed, it would be impossible, because a immaterial being would not be able to reflect, absorb, or obstruct visible light. Thus they would be unable to be seen by the human eye.
Also people see them, so they must be explained.
People say they've seen them. That's a completely different phenomenon - why people claim to have seen ghosts - with completely reasonable, material explanations that have absolutely nothing to do with the impossible act of seeing impossible beings.
If children do this today they did it in the past.
If it's possible, then nearly everybody should be remembering past lives. But the vast majority of people do not, which suggests that "past life memories" are really nothing more than confabulations. In nearly every known case, it's possible to prove that the subject would have contemporary knowedge of the culture and circumstances of the life they claim to be remembering, so there's really nothing to support the contention of past life memories. It's a tissue of supposition that falls apart at the slightest skeptical inquiry.
Anyone who was alive during the "Satanic ritual abuse/recovered memories" scandals should be highly skeptical of fantastic accounts of past lives lived. Indeed, the human imagination is a very powerful tool. Every human being has the ability to remember things that never happened -
could never happen - at will.
We would expect birthmarks etc. to match to real wounds simply by coincidence, particularly if the past life account is sufficiently generic to match a large number of people. And the sheer number of people at any one time who all claim to have lived the
same past life - Napoleon, Ceasar, Cleopatra - suggests very strongly that the whole enterprise is subject to a very large amount of wishful thinking.