Did Angels build the Great Pyramid and all the others? Why not? Please read the Book of Enoch to find the answers.
Enoch told us how the fallen angels brought the knowledge of alloys, blacksmithing, drugs (power of the roots of plants), fashioning weapons. All this technology was given to the Ancient people. This was even before the time of Adam. The angels who had the only knowledge on how to build the Pyramids and certainly the numbers and the power to do it. Angels with their overwhelming knowledge and power could have been mistaken for gods. Think about it.
The Bible can give you all the answers if you know where to look for it.
I am not an Evolusionist nor a Teologist, but I think combining these disiplines will give answers.