Islam is not a religion. There is no separation of sacred and secular, and as such, it is wholly incompatible with American notions of freedom.
We know that and they will learn it the hard way soon enough.
Completely depends on the Muslim.
I know LOTS of Christians(?) who smoke, drink, curse God, commit sexual sin and claim to be a christian simply because they live in a christian culture.
Is there a separation of sacred and secular in their lives?