Even if you do belong to those weird religious groups, it should be illegal for everyone, except for medical necessities. Doing similar things to girls is illegal in most sane countries too.
Too bad if a family is Jewish and thinks it's important, a doctor would not allow you to remove your baby's healthy appendix, leg, eye, and foreskin of course should be part of that.
I've read about that when the circumcised baby boy receives his first immunizations, the pain/crying/reactions are much bigger than the uncircumcised boys, as the circumcised boys are sort of reliving the trauma of the circumcision --- horrifying.
Still, see how many circumcised men will accept that their penis has been deformed - most will not want to hear it, really sad in a way.