I think we worry too much at times. I am a big prayer. God is bigger than you and me. Prayer is most powerful. He will raise the perfect laborer for that person with prayer. It is now reported many Muslims are having dreams opening up bibles and walking into churches. I believe this is our prayers in Christ. Wonderful.
I believe God can bring people to faith any way He chooses.
But He has told we believers how we are to bring others to an understanding: faith comes by hearing.