Proving things out of the Qur’an when witnessing to Muslims would be basing your discussion on faulty ground. Instead, you have the Word of God, and even though Muslims believe it’s been perverted, we know that God’s Word is powerful. It’s like a hammer smashing rocks; it does what it’s sent to do, never returns void, and goes directly to the heart of a matter.
"Is not my word like as a fire? saith the Lord; and like a hammer that breaketh the rock in pieces?"