No Christians follow that rule. Christians have never believed they were bound by such Old Covenant laws on things like that, circumcision, kosher food, etc.
Most Muslims don't need to be willing to, or even approve of, commiting acts of violence for their group, as a whole, to pose the threat of violent jihad to us non-Muslims. Where Muslims go, it's a safe bet there will be those pushing for sharia and committing acts violence against infidels.
It's a myth that Muslim terrorism is the result of poverty, lack of education and opportunity, and oppression. All of the Muslims who have engaged terrorism against the West; Faisal Shahzad, Nidal Hasan, Umar Abdulmutallab, Carlos Bledsoe, just to name the more recent ones, just to name the most recent ones, have come from wealthy, educated backgrounds.