Unfolding in Iraq, a fierce campaign by the Sunni Muslim organization ISIS against “infidels”, in particular, Shia Muslims, Christians, and Yazidis. (I’m skipping here what ISIS stands for, and whether some other label entirely should be used for the organization.) Jews would of course be on the list, but there aren’t many left in Iraq; ISIS proposes to get to the Jews by attacking Israel, but only after they eliminate Iraqi infidels first — by the classic tactic of requiring them to convert or be killed. (The Convert or Die tactic is familiar in the West from the long history of Roman Catholic impositions on other groups, especially the Ottoman Turks, but also Jews and (what the Church saw as) heretical Christian sects.)
Obviously, what counts as an infidel depends on your point of view, as will become clear from a run through the OED2 entry. But first, some notes on the etymology.
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