Even if you prove them dead wrong with the Scriptures, they will still hold onto their unbelief (Mark 7:6-9; Luke 16:31). There are people all over the world who want to argue religion. We do NOT need to debate with them; but rather, just keep giving them the simple Gospel of Jesus Christ. The POWER of God which brings salvation is the GOSPEL itself, and not our cleverly worded arguments.
DO NOT get into heated futile debates that go in circles and waste precious time. Go fish somewhere else. A fisherman is looking for hungry fish, not stuborn fish. Cast the Gospel lure somewhere else.