When there's noises being made about using uh... "Baptista Law" to settle things like divorces, and minor community disputes, I'll get more concerned about the mega-churches.
My problem is that codified within Islam is the concepts of Hudaibiya and Taqiya which leaves me with a sinking feeling of being played for a fool for any tolerance or reasonableness I may show.
OTOH, they may both be extremely useful concepts by fundamentalist Islamists who wish to exactly foster such distrust within me of moderate Muslims who fully support American institutions and secular government.
My Libertarianism also comes directly in conflict at times with the notion that: "The Constitution was never intended as a suicide pact."
And, I've got worries that acceptance/tolerance of moderate Islam can provide fertile ground for the radicals. Even when you take it with a huge grain of salt, what's going on in Europe and the U.K. around this issue is deeply disturbing.