Let’s ban immigration from Muslim countries (with a few exceptions).

Well, now that we know that the suspects in the Boston massacre are Muslims from Chechnya, and were granted "refugee" status at some point, can we now have a new ban on all immigration from Muslim countries (with perhaps an exception for Iran, where, based upon my own intelligence gathering, the majority of the people in Iran are rather non-religious, which is not surprising since the fanatical Iranian regime seems severely out of step with the views of their subjects)? Okay, another exception: if that immigrant and/or visa seeker proves that they are seeking to immigrate to escape the persecution of the Muslim majority...