Why does the Cave of Treasures say Adam was buried at Golgotha?

In this book the burial is planned from the day Adam leaves Paradise. God tells him that his sons must embalm his body and keep it in the cave, and that one day it will be carried to the centre of the earth, because redemption for Adam and all his children will be made there. Adam passes this command to Seth, and each patriarch hands it on until it reaches Noah. Noah takes the body into the Ark and, before he dies, tells Shem to remove it in secret with Melchizedek. An angel leads them to Golgotha, where the earth opens in the form of a cross to receive the body. The book explains the name Skull by saying that the head of all mankind was laid there. It also says Adam was first created on that same spot, where the Cross was later set up, and that Abraham offered Isaac there. The writer's point is that the place of Adam's creation, his grave and the crucifixion of Christ are one and the same.