How so? According to Judaism, the whole point of circumcision is to bear the mark of the promise between God and Abraham. But if you ask me, a modern non-orthodox Jew, circumcision is a rite of passage just like Communion, or Bar Mitzvahs, or any other non-natural step in growing up. It's different for everyone and no one has asked me why it is important. But I think that's really what it comes down to, Circumcision in Judaism is a physical and indelible representation of our belonging to a community whose practices have shifted and adapted over the millennia. One of the very few practices that is described in the Torah and is also carried out today is the brit milah. So, it's carrying on tradition. It is a connection (membership?) to a rather diverse group of people. It transcends geography and time, culture and language. It may be arbitrary - maybe Jews could've figured out another way to achieve all this. But I still don't understand the harm caused by circumcision. At least, no more harm than is caused by a huge number of medical procedures all types of kids may undergo as minors.