The point I was making is the covenant between God and the Jews was the first...
Many cultures and peoples copied them...
Many Jews fell away from the faith or intermarried with non-Jews. and keep their customs...
The old testemant is filled with stories of the Jews turning away from their faith and intermarriging with pagan religions...
Abraham was born, supposedly, sometime around 2000 BC.
At that point in time, there is good archaeological evidence various Arabian and North African tribes had been practicing circumcision for something around 4000 years, the Egyptians probably for over 1000 years.
The Australian aborigines for around 8000 years, though obviously not in contact with the patriarchs.
IOW, it was not a new or unique practice when the Hebrews picked it up. While it may have set the Hebrews apart from many of their neighbors, they shared it with many others. I don’t think the Bible says anywhere that nobody else practiced it, I think you’re reading that into the text. If I’m wrong on that, I’m certainly willing to be corrected.
“Herodotus (485-420 BCE) observes and deplores circumcision among the Colchians, Ethiopians, Phoenicians, Syrians, and Macrones, as well as the Egyptian priestly caste.”
Herodotus was of course 1500 years or so after Abraham, but the widespread nature of the procedure is interesting.
http://historyofcircumcision.net/index.php?option=com_content&task=view&id=31&Itemid=54