Stupid Pyramids

[Fake Messiah]

The Pharaohs wanted their grave goods protected, so they could use them in the afterlife.  So what did they do?  The buried them under mountains of stone that any grave robber could see from literally miles away

Sure, but you must understand that pharaohs considered themselves to be gods and they wanted to show to the people who was the boss and what better way than building giant buildings.
So did other religions follow, like christianity with it's large cathedrals which were the largest buildings in christendom until quite recent times.

What was really stupid about building these giant buildings was the blind faith in these stories meant that human efforts frequently focused on increasing the glory of fictional entities such as gods and nations, instead of bettering the lives of real sentient beings.