An idea would be to just come up to muslims (women night be easier to notice because of their coverings), and just ask a kind of "interview question"
are you sunni or shia?
have you ever herd of following the Quran alone?
you should research about it.
Women... hmm what I fear for them is that if they start rebelling against their possibily strict husbands that it can make things tough.
Also I have had this idea for a bit that the place that it can spring with success would be Iran or Turkey considering the people have a pretty secular mind as is and Quran alone fits the secular ideology quite well.