The pictures on the Egyptian monuments reveal that Ethiopians were the builders. They, not the Egyptians, were the master-craftsmen of the earlier ages. The first courses of the pyramids were built of Ethiopian stone. The Cushites were a sacerdotal or priestly race. There was a religious and astronomical significance in the position and shape of the pyramids. Dubois points to the fact that in Upper Egypt there were pictured black priests who were conferring upon red Egyptians, the instruments and symbols of priesthood. Ethiopians in very early ages had an original and astounding religion, which included the rite of human sacrifice. It lingered on in the early life of Greece and Home. Dowd explains this rite in this way: "The African offered his nearest and dearest, not from depravity but from a greater love for the supreme being." The priestly caste was more influencial upon the Upper Nile than in Egypt. With the withdrawal of the Ethiopian priesthood from Egypt to Napata, the people of the Lower Nile lost the sense of the real meaning of their religion, which steadily deteriorated with their language after their separation from Ethiopia
You can find more information on this in the book "Our true black history 7000bc-Present"