You are correct that the children of the fallen angels assisted in the building of the pyramids. Unfortunately most do not know who the children of the fallen angels are. The children of the fallen angels are called "ALIENS". The children (aliens) are no different than their parents. Their parents did not have reproduction organs and therefore had to clone in order to have children (aliens).

So who are these "sons of God" who mated with these "daughters of men"? They were humans from other planets who were sent to earth on assignment. These sons of God (humans) got lonely and married daughters of men. You must understand that humans born on the earth are called "sons of men" and "daughters of men". There was no need to mention the "sons of men" because the "sons of God" did not marry the "sons of men".

If people of planet Earth would only understand Genesis 6 then they would understand what GOD is doing all over the Universe. When creating a new planet for human life God always creates a "son of God" (ADAM) to leave in charge. Eventually God gives the "son of God" a mate (EVE). They work together to take care of the planet and teach man (NEANDERTHAL) how to survive. Man (Neanderthal) is created on the 6th day and Adam (son of God) is created on the 7th day; as recorded in the Bible.

Because humans do not properly read the Bible they don't understand the difference between children of fallen angels (ALIENS), sons of men (humans created on the sixth day) and sons of God (A human created on the seventh day). Each life bearing planet is equipped with a son of God who is in charge of everything.

On this Earth the children of fallen angels used slave labor of the humans to make the pyramids. The humans along with the aliens knew how to lift heavy object with the use of SOUND WAVES. This ability is still available today on this planet but sadly mankind has forgotten how to use it. Aliens still know how to use.

Now the best way to learn this information is by following the steps provided in the Bible:

1. Ask and ye shall receive (from the Holy Ghost)
2. Seek and ye shall find (from the Holy Ghost)
3. knock and it shall be opened unto you (by the Holy Ghost)

Notice how the three steps spell out the word A S K and is found in Matt: 7:7.

Finally if you don't think there is life on other planets then you are guilty of overlooking the words of Jesus in John 14:2-3

Joh 14:2 In my Father's house (UNIVERSE) are many mansions (PLANETS): if it were not so, I would have told you. I go to prepare a place (PLANET) for you.
Joh 14:3 And if I go and prepare a place (PLANET) for you, I will come again, and receive you unto myself; that where I am, there ye may be also.