Wow! You know what, the first question answered in the first clip, was exactly as I have said many times -- it is amazing how some minds can be in such agreement!
The question I am referring to is the one about, why the witnesses are Christians, as opposed to non-believers.
A good question to ask someone like this would be, if you saw it, would you believe it? If they say yes, then that is the proof, all the witnesses believed. They were not believers before, but after seeing, they believed.
Of course, there are a few points of attack to a defense like this, but strictly on logical grounds, there is very little one could argue against it, and have an upper hand.