Jesus certainly was circumcised, but to claim that john did it is a stretch, there are more reasons to suppose that joseph did it eventually, or even simeon. That or some unknown mohel, nobody knows, nowhere is mentioned who circumcised jesus
Either way it was a Jewish tradition known as Brit Milah which has existed since the construction of the Second Temple 515BCE
After Christianity and Second Temple Judaism "split apart from one another", Milah was declared spiritually unnecessary as a condition of justification by Christian writers such as Paul the Apostle and subsequently in the Council of Jerusalem, while it further increased in importance for Jews.
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