Holy Zohar text. Daily Zohar -49.

The process of the circumcision requires a material vessel (usually a simple cup) with soil to place the foreskin in it. This is the first act of judgment on the body and also the first correction on the physical level.
The Sin with the primordial snake cause Adam and Eve to have skin over their clothing of light. It created also the three Klipot that we remove during circumcision.

The removal of the foreskin and placing it on the soil is like putting sacrifices on the alter.
One aspect of this action is to feed the snake with the effect that caused by the sin. We know that God cursed the snake and the ground אדמה because of him. (see Genesis 5:29)

The sin brought the element of death to the world. That potential death energy exists in every beginning. To draw the protection and success to all beginnings, think and create continuity.

מקור הקטע: הקדמת תיקוני הזוהר עם פרוש מעלות הסולם (רבי יהודה צבי ברנדויין זל) פסקה 239