First start with idea…
	Search for common ground…
	If you look at the New Testament you will notice that Paul’s approach to reaching people was different depending on who he was speaking to.  For example, in Act 28:23 when Paul was speaking to the Jews and the God-fearing Greeks he used one kind of approach, yet when he was speaking to the polytheists in Acts 17 he used another kind.  In Acts 28 Paul merely showed that Jesus was the fulfillment of the Old Testament prophecies written about him.  He did that because they already accepted the idea of a monotheistic God (common ground between Paul and these listeners).  They also already accepted the authority of the O.T. and had some ideas about the Messiah (more common ground), though their picture of the Messiah was distorted.
	Yet in Acts 17:23-31 when Paul was speaking to polytheist who did not accept the Old Testament and a belief in a monotheistic God, he used another approach to begin with.  He started with talking about the unknown God that they worshiped and used that to talk about the characteristics of the Christian God who made the universe.  Here Paul used the belief between himself and his listeners of Creation being the work of “a” powerful divine being as common ground.