That feels like apples and oranges being compared. It's one thing to block out a specific country (we do this even now to some degree due to different visa rules for various countries) and an entirely different thing to block out a religion, especially one that has a respectable following already existing in your country. You would encourage outcries and riots while also being stuck trying to screen people for something you can't screen or check. For all they know, a person's following Zoroastrianism.

And a weapon like this is pretty much the exact reason our battleships have been getting fitted with anti-missile railgun systems

Having to wear certain clothes because of arbitrary designations of professionalism. Or simply having every single brand use completely different sizing scales for no reason.

I would say metal music and long hair, but those seem to be making a comeback again. Seen several long-haired guys out and about these days.

Humans :D