I would like to share a experience of evangelism.
I was on the streets, and we where going up to people offering the gospel of John and asking them what they thought about Jesus. One young man said to me he looked at the world and decided God did not exist. I reponded I looked at the same world and saw God everywhere. He came to the Lord.
The real point of doing this is to give opportunity to people to reach out and question some important things. But that is all it is, a public open interaction. And it does bring fruit. It is not done by only heritics, but as a diversity of approaches to reach out to people. The problem is it is just a 5 minute contact, but if a church cannot even do this at any point, it needs to get a better understanding of what they believe.