If the human body is perfect in its natural state as God intended, why do we need circumcision?

The earth and everything on it is covered with the veil of death, a result of sin. As the veil of the temple was torn in two from top to bottom[as a sign to show the way through the veil] when Jesus gave up the Ghost, so also circumcision, in that day, was a sign to show Abraham and his descendants were given a way through the veil.