Throughout Jewish history, circumcision signifies the covenant between the Jewish people and G-d, blessed be He, as the Torah says (Genesis 17:11).
However, male circumcision is also one of the oldest known human surgical procedures,with historical records and archeological evidence dating the practice back to ancient Egyptians in the 23rd century BCE.
Given that circumcision is of such an importance to serve as a literal marker of the covenant, why is this not a unique ritual which would IMO maybe make more sense for something this important. Perhaps someone could confuse it with Ancient Egyptians, so I don't get why something so important is also something that was rather common in the culture that Israelites came from.