or hitting the submit button too early... damn.
(or, rather, not always trying).
At any rate I'm happy to accept that the alien astronaut interpretation is not impossible. But, without physical evidence, and with only records in art and ancient literature that can also be interpreted as expressions of creativity and symbolism, then it remains unlikely. Equally with the hurdle to cross of being absolutely sure that we aren't seeing things that we are familiar with even if that is not what was intended, it remains a very difficult thing to prove that some level of bias on our side is not involved in interpreting all this correctly as accounts of alien visitors. We've all heard of aliens, we have seen fictional representations of alien spacecraft, etc etc, so it's an idea that most of us will have in our head whether we want to or not.
All of this, and more, makes the interpretation you're offering as highly unlikely, and the symbolism interpretations rather more likely. I doubt we'll ever be certain one way or another, and maybe fresh physical evidence will show up that lends more weight to the "alien visitors" hypothesis in the future. Until such time, I hope my position comes across as reasonable.