If Obama called a press conference and said "Hey guy's world will end in three days" Would everyone believe him?
Would the likes of Alex Jones or other 3rd party news sources support him in what he said? Within minutes.. no, seconds, his words would be rubished on the foums and in the news by every conspriacy theorist there is saying "No, no, this is a ploy to create commuter chaos and reduce population" or "Nah, false flag.. the hour will come, nothing will happen, then some GI joe
if some god worshipping happy clappy guy said the world was ending soon because his gods told him so, then I would carry on as usual and book next years holiday.
If we saw some big glow in the distant night sky and NASA said it was heading towards us and was big enough to destroy our planet, then I would definately take that seriously.