Why do jewish people circumsise their babies?
It was to be a symbol of the new covenant between God and Abraham that, because of Abrahams's faith and willingness to sacrifice his son, Isaac, at God's behest, God would never again ask for sacrificial offerings from His followers.
Lol, have you seen year one??
I don't really know why, some warped religious belief that god wanted people to mutilate their sons...