Peoples around the world are leaving Islam, they dont have to go to imam to know what is Islam, people are reading Quran themselves and quitting it.
Yes, many Muslims turn to atheism, but cannot admit it, because it is dangerous to do so. The penalty for apostasy is death, or at the very least being disowned by your family and community. Yet an arabic translation of Richard Dawkin’s God Delusion has reportedly been downloaded from the internet 10 million times, 30% from Saudi Arabia.
It is a bit easier to leave the faith in Western countries, but even there disownment and even physical threats are common. Check out the Council of Ex Muslims in Britain, and there are similar organisations elsewhere
I think that this death cult will suddenly collapse in a generation or so, like Communism did