According to the prophet Mohammed piece be upon him. At the end of this life or this world, there will be people who doesn't believe in anything and he described them of being the worst of human kind throughout history.

Knowing that, at the time, the sun will already start rising from the Ouest and all the big signs of Kiyama will be completed. Even if you don't believe in these superficies, think about someone who witnesses the sun coming from the other direction. See somebody who turn rocks to gold and bring people to life. On top of all, there is no repent at that time. Nothing is accepted. Their up-spring will live like animals if it's not worse.

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