In religion this is nothing new: it's known as hypocrisy, which is despicable because a hypocrite inevitably ends up exploiting true believers, taking advantage

In religion this is nothing new: it's known as hypocrisy, which is despicable because a hypocrite inevitably ends up exploiting true believers, taking advantage of their trust and goodwill. It's a well-studied phenomenon in religious literature (at least from what I know of Christianity and Islam). Tolstoy wrote much about the hypocrisy of the Orthodox leadership in the Russian Empire, and hypocrisy is a central theme of the Koran. Religious people are well aware of the fact that many of their fellow practitioners (including leaders) do it for societal/family/community/health/power benefits without actually believing in any of the rhetoric. Hence the classic clergy child-abuser, for example. Talking about hypocrisy is not forbidden, rather it is necessary for a person to regularly question themselves to recognize hypocrisy and remain true to their beliefs. Someone who doesn't believe should leave, because otherwise they may inadvertently or knowingly turn into "a wolf in sheep's clothing".