See the comments of Turkish pastor Fikret Bocek, here
Whenever I am in the US people in different churches tell me that thousands of Muslims are converting through dreams and visions. Some missionaries here are exaggerating the situation when they tell their tales in their own countries. Some missionaries even encourage each other to look look for those stories in Turkish villages where dreams are shared in public gatherings with some folk tales…etc. I have even seen some missionaries asking Muslim converts whether they remember seeing an old man in their dreams! And encouraging a form of deception. I don’t see people converting through dreams or visions here in Turkey. I have heard some people dreaming about an old man with white beard. Old man with white beard is common among the Muslim Arab, Iranians and Shamanistic Turkish cultures. When you encourage people to talk about their dreams they will tell you stories. But Christians should abandon this practice. How can Muslims repent without the preaching of the Word? How can a Muslim become a Christian after seeing an old man in his/her dream without knowing anything about Christ’s substitutionary atonement?
While you're there, listen to the interview with him here. It's very encouraging.
But muslims DO have the NT and revere Jesus as a prophet.
They’re not completely ignorant of Him.