Yeah a better analogy would probably be female genital mutilation but americans generally aren’t familiar with that.
The real issue is consent. I get that parents consent for their children, but that doesn’t mean the parents are correctly predicting the kid’s preferences.
It’s just a strange practice that we do in america, not due to religion, but due to … reasons? Cleanliness? “I want my son’s cock to look like mine?” it’s weird as hell, but accepted for some stupid reason.