Assuming you go to church, are you comfortable with a clandestine FBI presence in your congregation from now on? You never know whether your pew-mate might be a militia member or an anti-abort crazy, afterall.
Of course not. I am, however, even less comfortable knowing that Islamic terrorists can rely on our own laws to protect them from the prying eyes of law enforcement, so long as they plan their attacks in mosques.
Sorry, but there's no good answer here. We have fanatics running around trying to kill us all. They're really serious about it. Bush is taking the right long-term measures (destroying the money men who fund these crazies) to eventually return us to something resembling ordinary risk. In the meantime, we have to deal with the reality that there are already al-qa'ida sleepers here with horrible intentions toward us, and we don't have the slightest idea who they are, or where they are.
I say let your local FBI agent sing some hymns, while his buddy assigned to the mosque tries to find out who's here to kill us.