I see Muslims as a minor threat in comparison.
Apples and oranges. More people die in car accidents in the US in three months, too. That doesn't mean automobile travel is a greater danger to us as a people.
The reason Islam is a greater danger is that Islam seeks to control your life and to punish or kill you for your conscience and beliefs. Illegal immigrants only want to make quick buck. In this context, illegal immigration from south of the border is a large and costly benign tumor, but Islamic extremism is rapidly metastaticizing malignancy.
"I submit to you that more casualties are committed in the U.S. by illegal Mexicans than by people from any other country."
That is an incredible accusation. Any data or evidence you have would be appreciated.