Last I knew there were five mega-floods that covered large enough areas they could be candidates for the Noah account, three in the Tigris-Euphrates basin, one the flooding of the Black Sea, and the other at the head of the Persian Gulf. All it would take to get from one of those to the Noah story would be a family surviving in a craft large enough to take their animals along, and not having evidence of other survivors, and then the writer/redactor to mythologize it.
Except we know that there was an event that had all those. The building was in Eridu, and if it had been finished it would have been the biggest ziggurat ever, except the project was abandoned. The language situation was that the city itself didn’t have a large enough workforce, so they obtained laborers from across the area they ruled; apparently whoever called for this labor force didn’t stop to think about the fact that they spoke a multitude of languages and so translators would be needed. Then IIRC there was a supply aand/or funding issue on top of the ridiculous inefficiency due to the language problem, and in the lull in construction the labor force just packed up and left.
The bit about it being a tower to heaven is a misunderstanding of the purpose of a ziggurat by westerners: Back then it was almost universal that high places were where the gods came down to meet with priests and kings, but Eridu and its fellow cities were on a plain. So since they didn’t have any mountains, their solution was to build imitation mountains that would allow the priests to ascend and communicate with heaven in hopes the gods would come down and speak with them.
To a people whose deity didn’t bother with high mountains, just with a designated place, it was easy enough to misconstrue what was going on, probably deliberately, and to tell the story in a way that attributed all the screw-ups to intervention by YHWH.
And right there is a major piece in the case made for the final version having been set down during the Exile: priests trying to lead the Israelites while they were all in Babylon would have spun things to remind their people that despite what it looked like, YHWH was still supreme – and to stay away from those pagan ziggurats!
In my university days there was a group of students who’d been atheists or agnostics until they got deeply into science and decided there must be a Designer. But everyone was rational enough to recognize that anything beyond that conclusion wasn’t science any more, though for the investigation of which candidate for Divine-Design was the actual one some tried to find some science in the various holy books; mostly, though, they examined the holy books looking for the most rational claim to deity.
And I always got a kick out of telling YECists that the branch of science with the largest number in our informal club wasn’t cosmology but biology – that it was the study of evolution specifically that brought the most to decide there must be a Designer.
It’s hard to deny at least some fine-tuning as there are a number of constants that have values such that if they were changed even slightly the result would be a universe that could not have life. But it’s not so straightforward as is often claimed because not all the constants are independent, plus it’s my understanding that there are some that can vary quite a bit without radically changing the universe.