Circumcision was one of those things that originated by people who were traced back to decendents of the ancient Hebrew patriarchs such as the Edomites and Moabites who are traced back to Esau and Isaac. It also became known in Egypt at some point in time. However it wasn't done by other peoples.
In first century Christianity, the practice was dropped because it was only a requirement for physical Jews under the Mosaic Law and Christianity was opened to everyone. Therefore they didn't force people to do it anymore though it didn't matter if someone did it to themselves by choice.
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