Built to attract tourist.
Pyramids not mentioned in the Bible. Might be in one of the 27 (I believe) books that were left out by the Catholic church. Known that Astrology was mentioned in a few.
Angels might be considered aliens. Angles had no sex organs..poor angles.
Went to Mormon missionary school for a while. Their Bible is loaded with aliens, space travel, angels, etc. I am a Jack Mormon at present. HBO's Big Love is pretty point on. Go to Four Corners (USA) when the true Mormons live.
Some experts offer that the pyramids were built for storing forbidden secret knowledge and a protection from invasion from the sky's. Not tombs for their kings and royal family's. Theory, by some, that deep under ground is where all the real treasures and knowledge is. And the pyramids are really diamond shaped.
The present Egyptian is not all that much connected to the original Egyptian during the great building phase of the pyramids. Racial difference, with mostly Arabian blood greatly mixed in after 3 to 4 thousand years. Something like present Greeks having really no racial connection to the original Greeks thousands of years ago. Just look at the old statues and art work to confer this.
Not really slave labor. This has been know for many years. Masons original planners. The Operating Engineers, local 170, union completed most of the construction of all the Pyramids