I think that there are many things in the New Testament that show us that the godliness of our conversation plays an important evangelistic role. The apostles are clear that we mustn't limit the explicit sharing of the gospel to formal preaching. It can also happen in ordinary conversations.
Mark DeverUnfortunately, many of our churches calibrate their life to these nominal Christians. The predictable result is that you get fake, hypocritical churches that confuse the message of the gospel and make it hard for others who are trying to do genuine evangelism.
Mark DeverAs a pastor, I have the opportunity every week to share the gospel publicly in a way that most of the members sitting in our church do not. However, that doesn't absolve them of the responsibility for reaching others with the gospel.
Mark DeverWe do not fail in our evangelism if we faithfully tell the gospel to someone who is not subsequently converted; we fail only if we do not faithfully tell the gospel at all.
Mark Dever