The ancient Israelite practice of circumcision differed greatly from the later Jewish custom widely practiced in the Jewish, Islamic and American worlds today. Originally the practice only involved removal of any extra foreskin protruding beyond the glans.
This allowed for the restoration of the remaining foreskin, a practice common among Hellenistic Judeans (Josephus, Antiquities 12.241, 1 Maccabees 1.15), but which is not allowed by modern curcumcision procedures.
Later on around 140 AD the Jews added another stage where the foreskin was cut further back, to the ridge behind the glans. The inner mucosal tissue was removed by use of a sharp finger nail or tool, including the excision and removal of the frenulum.
Later during the Talmudic period (500-625 AD) a third step began to be practiced in which the Jew circumcising the child would suck the blood from the circumcision wound with his mouth (James E. Peron, Circumcision: Then and Now, Many Blessings vol. 3 pp. 41-42), something expressly forbidden by God’s laws (Leviticus 17.10, 14, Acts 15.20, 29).
The perverse adaptation of the circumcision procedure has been incorporated into the practice of Jewish ritual murder, a well documented historical phenomenon. For example, St. Simon of Trent was circumcised and the blood thereof collected for the purpose of use in perverse occult rites.
While we as Christians are not supposed to be circumcised, it is important to understand the difference between the rite commanded by God and known to the patriarchs and the perverse concision inflicted on boys today.
“2 Beware of dogs, beware of evil workers, beware of the concision. 3 For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh.”