Click to Enlarge Graphic
Here are a few points about Abraham and Cheops, you decide.
1.) Abraham went into Egypt after he received his ascension ritual.
2.) At the time of Abraham, the Pharaoh was a descendent of Ham, and not then eligible to hold the priesthood. 
3.) The Hyksos (Shepard kings) ruled Egypt part of the time, and were kin of Abraham (if not Abraham himself and/or his descendents). As such they were candidates to hold the priesthood. 
4.) To at least a great degree, the Egyptians had knowledge of the ascension ritual at some point and passed it along, in degrees of corruption. To the degree of the corruption that was passed-on, I will leave to the reader to decide.
The Great Pyramid (of Pharaoh Cheops) was built sometime around the period that Abraham was in Egypt. The pyramid was permanently closed with a plug, and there was never a body interred there. The pyramid included all the necessary symbolism for use in ascension rituals. It had three basic levels. At the bottom, which was subterranean (representing the telestial kingdom), is found a pit that could have been used to store water for washings. The next level up is called the Queen’s Chamber, representing the terrestrial kingdom. It was higher in the structure and larger. You then ascend to the King’s Chamber (representing the celestial kingdom). It is larger and grander. There are two basic sections. The first could be used for teaching and initiation, then, as you go through a section meant to divide the two rooms, the final room is entered. There was a box (or ark) in the room. It does not take much to assume this ark contained the law, and that the initiates would kneel at this ark or alter.
[ 1 - Abraham 1:27]
[2 - See Joseph of Egypt, Elder Mark E. Peterson, Deseret Book, The Land of the Nile. See Improvement Era, 1923, Elder J.M. Sjodahl, Tut-Ankh-Amen and Sun-Worship.]
[3 - “Two air vents (M, N) passing through the entire body of the Pyramid ventilate the King's Chamber. In itself this is sufficient to establish that the building was not intended for a tomb.” Manley P. Hall, The Secret Teachings of All Ages.]