"As sharia is a cornerstone of islam, we agree aspects of islam are already illegal and have to be restricted."
Insofar as Muslims break US laws, they should be prosecuted. We have no law here against some things, like the wearing of burkhas, so Muslim women may wear them if they wish. Most do not.
Unless that is, you're doing something like applying for a drivers license, say in Florida for eg...
The name Sultaana Freeman ring any bells?
What Islam needs is a New Testament to the Koran just like the KJV of the bible needed one.