I heard that in my christian circle a few years ago about muslims. God is calling them thru dreams.
If you think of the Holy Ghost as being a fire, and those living with the Holy Ghost in them, and working through them, then as they encounter people they can feel the “heat and fire” of the Holy Ghost, and then their spirit and soul recognizes the truth, then the truth will manifest in their dreams, and or subconscious, drawing them to Jesus. If muslims hear the Word, the Truth in the Word will lead them from the false god of islam, to the true God of Abraham, and our Savoir Jesus Christ. My 2 cents worth.