Circumcision
Circumcision is very important to most branches of Judaism, with over 90% of male adherents having the procedure performed as a religious obligation. The basis for its observance is found in the Torah of the Hebrew Bible, in Genesis chapter 17, in which a covenant of circumcision is made with Abraham and his descendants. Jewish circumcision is part of the "brit milah" ritual, to be performed by a specialist ritual circumciser, a "mohel", on the eighth day of a newborn son's life, with certain exceptions for poor health. Jewish law requires that the circumcision leaves the glans bare when the penis is flaccid. Converts to Conservative and Orthodox Judaism must also be circumcised; those who are already circumcised undergo a symbolic circumcision ritual. Circumcision is not required by Judaism for one to be considered Jewish, but some adherents foresee serious negative spiritual consequences if it is neglected.
History of male circumcision
The Council of Jerusalem in Acts of the Apostles 15 addressed the issue of whether circumcision was required of new converts to Christianity. Both Simon Peter and James the Just spoke against requiring circumcision in Gentile converts and the Council ruled that circumcision was not necessary. However, Acts 16 and many references in the Letters of Paul show that the practice was not immediately eliminated. Paul of Tarsus, who was said to be directly responsible for one man's circumcision in Acts 16:1–3 and who appeared to praise Jewish circumcision in Romans 3:2, said that circumcision didn't matter in 1 Corinthians 7:19 and then increasingly turned against the practice, accusing those who promoted circumcision of wanting to make a good showing in the flesh and boasting or glorying in the flesh in Galatians 6:11–13. In a later letter, Philippians 3:2, he is reported as warning Christians to beware the "mutilation" (Strong's G2699). Circumcision was so closely associated with Jewish men that Jewish Christians were referred to as "those of the circumcision" (e.g. Colossians 3:20) or conversely Christians who were circumcised were referred to as Jewish Christians or Judaizers. These terms (circumcised/uncircumcised) are generally interpreted to mean Jews and Greeks, who were predominant; however, it is an oversimplification as 1st-century Iudaea Province also had some Jews who no longer circumcised, and some Greeks (called Proselytes or Judaizers) and others such as Egyptians, Ethiopians, and Arabs who did. According to the Gospel of Thomas saying 53, Jesus says: