Perhaps an ironic reply on my part but I disagree. I always think that arguing the point (for either side) is worthwhile because it will increase everyone's understanding, even if they don't acknowledge it initially.
In normal cases I would agree, however the evidence would show that Kedge and a few others will simply ignore anything that doesn't fit within their preconceived attitudes and no matter how much you try to explain, either from a scientific or religious perspective just how ill informed they are they will argue white is black. There are a myriad of threads where this has happened, and a huge one in SC where many people spent a huge amount of time and effort in explaining to him, but to no avail. You are better off trying to reach those who are able to assess things objectively and are willing to at least listen.