> 3 days of darkness that prophecy...  could be result of nuclear/biological/chemical warfare. emp takes out powergrid leaving people in "the dark" untill power is restored  nuclear mushroom clouds block out the sun  "demons in the street" could be shitskins on a robbing /killing spree "close curtains and stay away from the windows" to avoid nuclear flash and muggers noticing you.. "don't open the door" to prevent muggers getting in.. "burn a blessed candle" fire could kill airborne pathogens.   but just as likely the prophecy is literal, and there will be actual demons roaming the street coming to reap souls.
Kekistani