News that by 2050 Europe will be 20% Muslim had me reaching for the classic Seinfeld tag "not that there's anything wrong with that" - apt because while we're obviously not comfortable with the idea we for some reason feel compelled by shame, false propriety, political correctness, cowardice or something worse to avoid admitting as much.
Unlike homosexuality, though, which probably doesn't represent a threat to Western civilization [shame on you] we would be engaging in some serious issue avoidance if we try to fool ourselves into thinking that a 20% Muslim demographic in Europe is no big deal.
