A lack of faith is NOT a function of intelligence
Somebody believing in something outside of the realm of popular science doesn't make them stupid. I can't remember who it was that said...
"I feel for all faiths the warm sympathy of one who has come to learn
that even the trust in reason is a precarious faith, and that we are
all fragments of darkness groping for the sun."
but I would agree with him rather than considering anybody believing in anything that cannot be scientifically proven (as far as anything CAN be scientifically proven) as foolish.
Just because something falls outside accepted science, that doesn't mean it doesn't warrant scientific investigation, and if the scientific study fails to return proof then "abscence of evidence is not evidence of abscence". There have been may scientific investigations into things like "auras" and some have had interesting results (forgive me but I'm yet to find the study that I thought was interesting).