If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
one that has a chance in a real debate.
good arguments don't in general have a chance in a real debate, because debates are not about reasoning. But that's a nitpick.
I've seen a lot of religious people claiming to have access to strong arguments for theism, but have never seen one myself.
As JoshuaZ asks, you must have a strong argument or you wouldn't think this line of discussion was worth anything. What is it?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.