It's not that God didn't want man to have foreskin. It was a show of faith by Abraham and a covenant like I said made between the two. There were also cleanliness factors involved I'm sure but those were the main two. Like I said, if God said to do it, It can't be bad cause God can never say anything that's "wrong" or "bad" cause God is good in all he says and does and has nothing but best intentions for man.