Being extremely practical and pragmatic, I do not believe in "spirits," and therefore feel certain all folk moved by superstition are the victims of their own minds, which have of course been programmed by themselves and others within the framework of their lives. In short, we spook ourselves!
Some years back, I believe it must have been in the seventies, a couple of neighborhood galfriends talked me into going to a "previous lives" all day thing. It was held in a high school gym and everyone was to take a blanket and pillow. A little bit more than 70 people showed up; a woman led us. Folk were all sorts of professions and, of course, being where I am from, a lot were government workers. Well, bottom line, in the afternoon here were 70+ people in a dimmed-light gym lying on their blankets listening to a soothing voice over mesmerizing music. And every cotton picking person in that gym EXCEPT yours truly got hypnotized and dreamed of their "previous lives." I have always found it a hoot how many were Queen Victoria, etc.!
I tried. Believe me, I tried. Just not a gullible wire in my head.
Another hoot, and I have many, was pointed out in the latest National Geographic. So many, many saints managed to have 50 fingers, instead of the usual 10 allotted the rest of us! Churches worldwide boast ownership of this bone, that bone, and t'other! All kept in gold and jeweled boxes on altars.