Yes actually, that book says if Jesus didnt live again, then it's a complete waste of time and to examine the evidence to decide for yourself.
And how do you suppose one should attempt to falsify that?
If you look at the evidence - and despite what you are about to say, there most certainly IS evidence to look at - and say yes, He did live again.... well that's going to be interesting for you, isnt it? But this notion Christianity is not falsifiable is garbage.
At the very best all you can do is say that some people from the first century WROTE that some other people had seen Jesus alive again after he died, some 40-50 years prior. It only works if you trust everything they wrote as being accurate. You can appeal to other events recorded in the same gospels, but now you've just increased the number of dubious events with no means of verifying any of them.
I think there is at best a lot of uncertainty surrounding the events, and at worst it's pretty damn likely there was no resurrection.