I do not believe that, most people do not consider visitation stories valid because of the size of the Universe, the probability of visitation is increased, but it in no way conceivably indicates that visitation has, or even will happen. That is a leap of faith.
And with them all being incorrect, does that not indicate dubious origin? It is the only way many could wrap his head around nature.
Not at all, unless perhaps you want to consider that Australia creation stories that say a giant snake carved all of Australia's river systems and lies under the ground. Where do we dig to have a look at this giant snake?
due to the way they are formed and/or the circumstances in which they appear seem to be of human origin
It affects your personal view, and I am afraid that is all.