For Jews at least it is not about health or any other advantages, it is just a religious command which suppose to be a covenant between a Jew and its maker, a b

For Jews at least it is not about health or any other advantages, it is just a religious command which suppose to be a covenant between a Jew and its maker, a bit like when people used to cut their finger and mix the blood to symbolise a covenant between people. Ironically, unlike other religion laws which non practicing Jews are not following, circumcision is almost universally practiced. I think the reason is that it is a bit of an identity thing, like Maori tattoos or something like that.