Christian proclamation might make the gospel audible, but Christians living together in local congregations make the gospel visible (see John 13:34-35). The church is the gospel made visible.
Mark DeverIt's fine to deal with people's doubts and explain why they have good reasons to believe in Christ. But until we tell them the good news of Jesus Christ, we haven't done our job. They need a saviour that God has provided them in Christ. Once they know that, we can do as much apologetics as we need to.
Mark DeverI love people thinking about apologetics. I just think that we have to be careful. We need to realize that we can argue about evolution or the existence of God or any number of things, but until we tell people the message of the cross, we have not evangelized them.
Mark Dever