I'm sure Dr Zakir Naik is a good person and a good Muslim. But when it comes to Deen, he is not qualified to get up on a podium in a conference of hundreds of people and on satelite TV because he can be the cause of misguidance for literally millions of Muslims. Therefore, when it comes to Deen, it is the duty of the qualified Ulamaa to examine very carefully everyone from among the Du'aat and relay their condition to the laity, so that we know who to take knowledge from and who to avoid.