Circumcision is not one thing worldwide.
> Circumcision is prevalent among 92% of men in North Africa and around 62% in Sub-Saharan Africa. In western and northern parts of Africa it is mainly performed for religious reasons, whereas in southern parts of Africa it rarely performed in neonates, instead being a rite of passage into manhood.[22]
> Studies evaluating the complications due to traditional male circumcision have found rates varying from 35% (Kenya) to 48% (South Africa). Infection, delayed wound healing, glans amputation and injury, bleeding, loss of penile sensitivity, excessive removal of foreskin, and death are the major complications reported.[23]
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> ...There are tribes, however, that do not accept this modernized practice. They insist on circumcision in a group ceremony, and a test of courage at the banks of a river. This more traditional approach is common amongst the Meru and the Kisii tribes of Kenya.[40] One boy in Meru County, Kenya was assaulted by other boys because they wanted him to be circumcised in a traditional ceremony as opposed to in a hospital.[44]
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> Amongst the Maasai people of Kenya and Tanzania, male circumcision has historically been the graduation element of an educational program which taught tribal beliefs, practices, culture, religion and history to youth who were on the verge of becoming full-fledged members of society. The circumcision ceremony was very public, and required a display of courage under the knife in order to maintain the honor and prestige of the young man and his family. The only form of anesthesia was a bath in the cold morning waters of a river, which tended to numb the senses to a minor degree. The youths being circumcised were required to maintain a stoic expression and not to flinch from the pain.[40]
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> In some South African ethnic groups, circumcision has roots in several belief systems, and is performed most of the time on teenage boys: "The young men in the eastern Cape belong to the Xhosa ethnic group for whom circumcision is considered part of the passage into manhood. ... A law was recently introduced requiring initiation schools to be licensed and only allowing circumcisions to be performed on youths aged 18 and older. But Eastern Cape provincial Health Department spokesman Sizwe Kupelo told Reuters news agency that boys as young as 11 had died. Each year thousands of young men go into the bush alone, without water, to attend initiation schools. Many do not survive the ordeal.[59]"
https://en.wikipedia.org/wiki/Circumcision_in_Africa (includes NSFW images).
[22]: https://pmc.ncbi.nlm.nih.gov/articles/PMC5422680
[23]: https://pmc.ncbi.nlm.nih.gov/articles/PMC3474774
[40]: https://web.archive.org/web/20080906115430/http://htc.anu.ed...
[44]: https://www.youtube.com/watch?v=x7dBMLHNxhg
[59]: https://news.bbc.co.uk/2/hi/africa/3069491.stm