Carrier lost by his own admission, on his home territory.

I've given a lot of thought to how I'd combat what he says, and what I think it comes down to is that standard, "simple" atheism that says "where is your evidence" isn't going to work; I would explicitly lead with the fact that religious language is completely incoherent and does not constitute an assertion about the world at all, and so there cannot be such a thing as evidence for it. And I would anticipate the way he's going to mock it by going there first: "I'm one of those closed-minded scientists who says he'll ignore the evidence for Jesus". At least when I play the debate out in my head, this is always where we end up, and if we start there I can deny him some cheap point scoring.