While I certainly love my conspiracy-theory-history stuff - I think that 'egyptologists' are all idiots in their explanations of the age of the pyramids, sphinx and their explanations on how these were built and by whom.
To construct a pyramid, you need to transport the blocks to the building site and then pile them up one by one. That's kind of it. There's actually a few different means of pyramid construction (do you build up from a base, or do you add more layers on the outside of a previous pyramid?), but it's achievable with very primitive levels of construction.
By contrast, Gothic cathedrals are very demanding in construction. You're not merely piling stuff on top of each other; there's actually a delicate balance of forces and several construction elements to hold up the structure. The walls barely hold themselves up, let alone the vault of the structure (that's why the flying buttresses exist), so you need to build support structures to hold things up while under construction. Furthermore, there is a heavy emphasis on very specialized skills to build the decorative elements in the cathedral, such as stained glass windows. The stone blocks aren't merely cut in a pretty simple pattern, they're extensively sculpted.
I was arguing the stupidity that the Giz pyramid was simply built in 20 years.
You may or may not be aware of the complexity of the pyramid, which is far greater than layering blocks of the same shape in a simple pattern.
Firstly, the core inner spaces are of a different material than the outer larger stones which make up the structure. Their size and way of creating the roof to the inner chamber defy the skills of any cathedral stonemasons.
So, I feel that your oversimplifying the topic.
It's also worth pointing out the labor pool is probably much larger in Egypt: the pyramids were probably built with corvee labor during the time when essentially the entire country was underwater. Cathedrals were built with substantially smaller labor pools, mobilizing only the resources of the local city rather than an entire (albeit pre-Classical) kingdom.
I'm aware that the Giza pyramids are far more complex than they appear on the outside, but my point is that pyramids (even the Giza ones!) are far simpler than cathedrals.
That they have encoded in that building the 13 28-day lunar months, the 72 years for precession to take place, the diameter of the earth etc etc etc..
Its a far more complex building than people realize.
WAY more mathematically sophisticated than a sculpted pretty cathedral.