IQ seems to be somewhat hereditary, but it's not always. You can find examples of "smart" parents with not so smart children, and some very intelligent children born to not so smart parents. There doesn't seem to be a direct correlation between IQ and soulfulness. I know some folks who are incredibly soulful and connected to what I'd describe as "inner grace" but they are not necessarily intellectual giants. The two can go together, but don't have to.
Regardless of whether or not we believe in the human soul, and I do, the intelligence of a person or his or her IQ does seem to follow a pattern in families. That being said, it speaks more to the idea of physical heredity and genetic makeup than it does to the idea of soul, which is more about motivation and direction.
Having the potential to do clever things, or a High IQ is so often wasted anyway. Many High IQ individuals are actually extremely Dumb, because their inherited Genetic, IQ ability is countered by a lack of learning or an unwillingness to learn.
For a High IQ to function well, the owner of the High IQ must have an Mind That Is Open and Rational, to utilize it well and Thus Be Smart.
Many people with High IQs, are indoctrinated into belief-systems that discourage learning, like Religions that teach them that a single set of scriptures has all the answers concerning the meaning of life and death.
These people cease to learn and become stagnant in their thinking, because their minds are closed off to information that may conflict with their world-view. Thus their IQ never sees the light of day and is wasted.
Even Average IQ citizens if they keep an Open, Rational Mind will be Smarter than those with a High IQ who have been indoctrinated into not learning, i.e. Religion and similar belief systems like Astrology.
Your future is planned for you by the stars or a God, so just worship or follow your star sign guidance is all you need to do.
IQ deadening world views make High IQ people dumber than many Low IQ citizens that have an open rational mind.
There is nothing Supernatural about that.
Because belief in the Supernatural, Destroys That High IQ.
There is nothing supernatural about getting a high IQ from your parents. It is science that the genes your get from your parents will be passed along to you, and you will have behavior that is similar to theirs. Getting a high IQ from your parents is simply the mixture of your parents carried on through you.
No, I do not think that the heritability of IQ says anything about the supernatural state of the human soul, because the fact that a person inherits their intelligence genetically has nothing to do with whether people live and die and what happens to their soul after they do. Intelligence is something that occurs when a person is alive on the earth. It does not affect after.
I do not see a link between a populations IQ and the supernatural nature of the human soul. For one thing, we have no scientific proof that a soul is real or even exists. Beyond that, we have no idea how it operates or works, even if it is real. Secondly, I don't see how a man made IQ tests could say anything about the soul or otherwise be linked to the soul.