The amount of prepuce (foreskin) removed during circumcision in antiquity varies greatly from that which we know to be generally the case today. Though the exact amount nicked or removed is not agreed upon by all scholars, religious Brit Milah performed in ancient Judaism is known to have been significantly less than today's modern Brit Peri'ah, where the entire prepuce itself is amputated (often along with the frenulum). While one form (Brit Milah) was a 'cutting of the blessing,' the current form goes far beyond this in a manner that is not based in religious text or faith doctrine in any way.
Biblical Circumcision: http://www.drmomma.org/2010/07/biblical-circumcision-information.html
Celebration Brit Shalom (book)
Questioning Circumcision: A Jewish Perspective (book)
Brit Milah Resource Page: http://www.drmomma.org/2009/06/circumcision-jewish-fathers-making.html
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