People are misunderstanding the true definition of “witnessing.” When properly done, there’s considerably more to witnessing than just standing up in front of people and saying, “Hi, my name’s Duck Duck Goose and I believe in Jesus.” What is supposed to come next is the question, “–how about you?” It’s supposed to initiate a dialogue between the witnessee and the witnessor. The reason you choose to witness to someone is not because you think they don’t know you believe in Jesus, and you want to set the record straight. The reason you choose to witness to someone is because you think that you might be able to lead them to Jesus, and this is inevitably going involve a certain amount of discussion, i.e. debate.
For this reason, people who want to use the SDMB for witnessing ought to post it in GD. There’s an implicit invitation to debate included in the act of witnessing.
It was my understanding that the line about “this is the place for witnessing, if you feel you must” was added to the GD Main Forums page after the Winter 1999-2000 invasion by folks from the Left Behind Message Board (which if you’re not familiar with it, was a conservative Christian MB). I thought that the mods got so tired of Fundies bursting into all the forums with their thinly veiled witnessing (in GQ, “Is there a God?”, in MPSIMS, “Here’s how I feel about God”, in ATMB, “Is this a Christian message board?”, etc.) that the administration added that line to hopefully direct their attention to the one forum that was set up to handle serious discussions of religion
I don’t think witnessing belongs in IMHO at all. It’s such a nice cheerful friendly place–why spoil it with the inevitable fistfights? You know as well as I do that anything to do with religion can only rarely be kept on a cheerful, “Hi, I love Jesus, do you?” basis. There are always going to be the bad actors and troublemakers who absolutely cannot sit on their hands and not post a “oh, yeah, who gives a fuck?”
Great Debates is set up to be our “terribly serious” forum, and that’s where all religious matters ought to go (outside of the simply technical questions, “How many tassels were there on Moses’ ephod?”)
And I think GD has been vastly improved by the creation of IMHO, “Great Debates Lite”, especially now that people are starting to get the idea that “God vs. Satan” is a Great Debate and “Britney vs. Christina” is not.