There is a massive catastrophe that wipes out much of the human race. 10,000 years in the future humans are abundant again in the world and have achieved the level of technology we have today. One major difference. There is no religion just science and reason.
By some odd chance archeologists will find the 7 Harry Potter books in every dig of every residence. And only the 7 harry potter books. All other books were destroyed.
What will they think of our world?