So we agree, I think, on that.
But perhaps not entirely on that.
To me, the "alien" explanation, while perhaps more plausible, is as verifiable (at present) as a supernatural 'god'.
Other than irrational belief, I can see no justification for dismissing the existence of a god .... whichever one it happens to be. And it just may be that those tribal peoples that paint strange narcotic substances on their faces, wallow in blue mud and worship a gnarled tree are the ones that have got it right, while those that dress up in fancy vestments (which, personally, would perhaps more my taste than smelly mud) and spend fortunes building fancy edifices, are wrong .... or vice versa. Both sets of rituals strike me, personally, as equally ridiculous.
But however ridiculous they seem to me, it remains obvious to me that they might be right. I have no evidence to disprove it, and the Bible just might be the word of God.
It's all very well us, TeePee, dismissing "supernatural" because it doesn't fit the laws of nature as we perceive them, but we cant know if there are laws we can't perceive. We can't know if our laws of nature are a subset of a much more general set of principles, or that they only apply in our portion of space or that there aren't parallel universes where different laws apply. Maybe "God" is a scientist in a parallel universe, and we're his latest experiment.
Do I believe those parallel universes exist? No, because I've seen nothing to support that belief. But that doesn't mean I believe they don't (or can't) exist, because I have nothing to support that, either. I just don't know.
It is not beyond the bounds of possibility, in my opinion, that something exists, and perhaps exists outside the bounds of our knowledge and perhaps even exists outside the limits of our ability to perceive or understand. Can an amoeba ever understand Windows Vista? Or nuclear fission? Does an amoeba have the senses or the intellectual capacity to understand concepts we take for granted?
So then, why should mankind be arrogant enough to assume he has the senses or intellectual capacity to understand laws which a "supernatural" being may operate by, but which are as perceptible to us as riding a bicycle is to an amoeba? Those laws may or may not be there, but either way, if we can't see them it doesn't mean they don't exist. Nor does it necessarily mean that something genuinely "supernatural" can't exist either. What evidence do we have to support a belief that a supernatural force can't exist? We may have theories, and speculation, and philosophical perspectives, but none of that actually proves anything.
That's my stance. God may or may not exist, and even if he does, we may never be able to 'prove' it. That's not necessarily a weakness either in natural laws or our understanding of them, but perhaps simply our lack of capacity to perceive or understand. It may be that the only way to "know" is to have faith. Maybe that's the way that some superset of natural rules that we have no inkling of works.