This is not my interpretation of Islam,what I explained is one of the foundations of jurisprudence in Islamic Law.Something that is harmful to your body cannot be permissible.
I'm not sure where you get the number "more than ten milion" from, but let's say more than 10 milion disagree, this means the majority agrees with me because there are 1.6 bilion muslims. The conclusion would be that there's consesus on the prohibition of FGM.
Muslims can disagree with each other in Islamic jurisprudence issues.
Principles of Islamic jurisprudence - Wikipedia
We aren't discussing if Islam is perfect or not, we are discussing FGM in Islam.