I used to teach Children's Literature in College. One book I had my students read was Rita Williams-Garcia's No Laughter Here
All my venezuelan students ignored that such a thing was done to little girls in many places of the world; most of my american students did not knowabout it either. They were all shocked at the story.
I am going to guess the parents involved are african muslims. Williams-Garcia's book is great because it is narrated from the perspective of an african american family which is very proud of their african ancestors, but when the mother, who is a social worker learns about what happened to her daughter's best friend (who is taken to africa by her parents and comes back "different"--read traumatized), she puts into question all blind racial afiliation.
You do not have to condone barbaric practices such as FGM just because it is practiced by people your own religion or race.
You did a great job clarifying that this is not merely an african practice or that Islam alone condones questionable practices. What is morally wrong is wrong no matter who does it.