ancestors ?
no evidence exists of humans having that technology and dont tell me god did it since that would be even more unbelievable.
To be fair there is no evidence of there being aliens either. No tangible, verifiable, indisputable, reliable, solid evidence. Yet scientists have no qualms on believing that.
And before someone throws a hissy, I am a scientist meself and am well aware of the hypocrisy and pseudo intellectualism that is widespread in the scientific community.
Back on the topic, many of the texts must be viewed in both abstract and literal terms, perhaps that should help get a better perspective on things.