A lot of points brought up, not sure how factual, but would be nice for someone to link some articles. This isn't a topic that you start searching about on Wikipedia. Good information is probably tough to come by on the topic.

One poster said the practice was symbolic but then got shot down by another poster saying it wasn't symbolic. Well which is it? If Judaism practices circumcision and there's "no real life or medical benefit" then it's going to appear to be purely symbolic.