The Authorship And Historicity Of Luke And Acts

I and a few other Christians have been participating in a discussion with a skeptic regarding the authorship and historicity of Luke and Acts, among other issues. The discussion seems to have come to a close. A lot of issues came up: the credibility of the tradition that Luke wrote Acts, the unity of Luke and Acts, the genre of Acts, the significance of the alleged errors in Acts 5:36-37, why Luke doesn't say more about the history of the church of Jerusalem, why Luke and Acts were separated by the gospel of John in ancient collections of scripture, etc. It was a lengthy discussion. You can read it in the comments section of the thread here.