I don't know if they did, but back then, people revered anything ancient
They believed that the older something was, the more "truthful" it must be. E.g., Hellenes mistakenly regarded Jews as a people with the most ancient books and religion[2], and therefore, as being true
I think it's somewhat similar to how Earthlings might react if we were to encounter an older alien civilization
This somewhat resembles the Lindy Effect on an intuitive level
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[1] https://en.wikipedia.org/wiki/Lindy_effect
[2] back then they didn't knew about Sumerians and Akkadians