It's my understanding that Islam requires a certain operation that most males would find objectionable. I wouldn't cut off an earlobe for $30, let alone certain other things. I've always found the practice to be quite strange for Muslims on account of the Quran's words when it comes to respect and preservation of the body as created.
I'm not sure what my libertarian friend above is thinking, but I don't find the prospect of adult circumcision to be particularly appealing. It is my understanding that current Islamic teachings requires such, despite not being found in the Quran.
I was born into a Muslim family and must have been circumsized when I was mere days old, so I guess it's no surprise I was puzzled at your question.
If Quora answers (I had to look this topic up) are anything to go by, it's not required though. Again, though, not a fiqh scholar. It seems though that opinions vary on how important circumcision is and when it needs to happen or is required, and people can get very opinionated on this topic.
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