Start a list and let everyone add to it at will:
Be-headings
Raping young girls
Mutilating children
Self mutilation
Murdering innocent civilians
Insulting other religions
Muslims states producing nuclear weapons
Using the Quran to justify terrorism.
Enslaving women.
Murdering other Muslims of a different sect (okay, even during Ramadan).
"Honor" rapes and "honor" killings.
Genocide.
Take it from there...