We must (as my Pope also mentions from time to time) categorically respect every sincere and peaceable manifestation of religious belief, no matter how seriously we may believe it is in error. As he said at the University of Regensburg in 2006, in a lecture that was maliciously misconstrued, we must further insist that our differences be discussed without violence and intimidation, and by the light of a reason that should be accepted as the common property of all mankind. In the conditions of the modern world, there is no alternative that does not lead to cataclysm.
Reason, and John Locke, have taught that we can afford to tolerate only the tolerable. We can accept no religious excuse from those who in fact counsel violence and intimidation. There can be no freedom that extends to murder. But it is for an impartial State to enforce reasonable laws, on the admirable principle enunciated in the Koran: "There shall be no compulsion in matters of faith." (Surah 2:256.)