When going to speak to someone or a group of people who are religious, but not born again, prayer is an excellent tool to draw their attention. In Nigeria for example, if you want to evangelise in a bus, because the people generally believe that prayers are effective, you can start with a short but powerful prayer asking God for journey mercies. When you have their attention, you can go ahead and preach.

“Then said Jesus unto him, Except ye see signs and wonders, ye will not believe.”
John 4:48

When people see signs, they will believe. Ask the people you wish to evangelise if they would like you to pray with them concerning any need they have. After you have prayed and God has answered the prayer, it will be easier to convince them to accept Christ. Many years ago, I had a team of youth who I had trained in evangelism. I had taught them that, when they encounter anyone who wouldn’t listen to them, they should simply ask if there was any issue the fellow wanted them to pray with him about. One day, they got to the house of a herbalist who was antagonistic. They said “Baba, we know you are very powerful, but is there anything at all that you have not been able to solve? We want to pray about it. “He told them that every time he got married, once the bride got pregnant, she would begin to bleed and bleed until she died. Now he had married again and his new wife was pregnant but, like all the others, she had begun to bleed and was close to death. My children prayed a simple prayer and left. They had only been gone for a little while when they heard someone calling them from afar. They looked back and saw the herbalist chasing after them. When he got to them, he said his wife has stopped bleeding and he was ready to accept Jesus into his life.
Written by Pastor E.A. Adeboye.

Unto our God be all the glory.