Absolutely. That should be reason enough for deportation.
The problem I see with that is the implementation. What would the criteria be for deportation..and deportation to where? I don't think you can just say "well if you think XYZ, then you have to leave" because 1. there are lots of civil liberties concerns (I know, I know, but what happens if we ever have a left-wing president who decides to use the precedent GWB set?) and 2. I can't find a way to execute a mass deportation like taht.
Our best bet is to infiltrate the mosques and start rounding up people who call for violence.