Religions used to defenc circumcision as being healthy and a means to reduce infection, all totally rebutted by modern medicine. If anything gives you a clue that something is up... is when a god asks for all the men to have their willy chopped !
It goes back to sexual repression, desensitising the end of the WANG so as to not enjoy sex as much. It is disgusting and practiced in the region both on men and women. Women lose their labia and the clioris, the vagina in sewn up so only pee can exit.
The need for blood and the element of triabl markings is also a part of it, all pre-jewish and all very pagan bullshit.
But yes... no belly button. Ok I lie.... the father and mother of mankind DID have a belly button as they had evolved from apes.