A friend of ours who was doing missionary work in a muslim country that shall remain unnamed, said the biggest factor in turning muslims against islam is sharia law.
The ordinary man on the street HATES sharia law and its end result is that it actually drives muslims from islam.
I’ve been told by a few former moslems that they converted to born again Christians after having a vision. I’ve heard that a lot. God must use those to speak to them.