Who will Hazrat Mahdi’s (pbuh) followers be?

From Mr. Adnan Oktar’s interview on A9 TV on 4 November 2013

DİDEM ÜRER: I would like to read a hadith about Hazrat Mahdi (pbuh), insha’Allah. “When the Qaim (the Mahdi) appears, those who imagine themselves to be the followers of the Mahdi will turn away from him. Those outside the faith, however, will believe in the Mahdi.”

ADNAN OKTAR: It is very strange. He will have no followers from among the radicals. Atheists will come and be followers of Hazrat Mahdi (pbuh). Christians will come and be followers of Hazrat Mahdi (pbuh). Or people ignorant of religion will come and be followers of Hazrat Mahdi (pbuh). The majority will be people like that. They will be ordinary people, not radicals or people who are already religious. Of course there are truly devout people among the devout, and my apologies to them.