Jews circumcise because it’s a religious ritual. In accordance to the Jewish law, male children are obligated to be ritually circumcised as one of a commandment from God, and would only be postponed or repealed if it will endanger the child’s life or health. This circumcision ceremony, formally known as ‘brit milah’, is performed by a ‘mohel’ on the eighth day of a male infant’s life. The basis for circumcision can be found in the bible, on Genesis 17, 10-14, where it says “This is my covenant, which ye shall keep, between me and you and thy seed after thee; every man child among you shall be circumcised”, an oddly specific command from God. Interestingly, the ones that practice Judaism do not believe that non-Jews are obligated to do the same. The circumcision symbolised the ties between God and Abraham and of course between God and the Jews, an entry into the Jewish community to the infant. It’s a tradition that is central to the identity of Judaism.