A lot of christians aren't Christian at all, I find. I only hope that as many Muslims are as lax in their observance as most of the Christians I know.
I am sure that there are a lot of Moslems who were by bad luck born into a family of Moslems and just have to go along with the general program. Since leaving Islam is subject to death penalty, depending of course on how strict the Islamic government is in any particular country, they’re stuck. But I have no doubt that many would prefer to leave Islam but have no choice in many places.