I would like to draw people's attention to an interesting list of historicity criteria for establishing historical credibility in claims about Jesus found in the New Testament (provided by Richard Carrier here). Recently, and showing a similar technique, I posted a piece on how Christians have a tendency to argue things in such a way that no matter what end of the evidential continuum we have, they would claim it as evidence for God or similar:
If the universe had been much smaller, just right for human life on a human scale, then the universe would have been obviously designed for humans, so would claim the same theist. The universe is the direct opposite of that, but still this somehow shows that God obviously designed it, such as the design being based on other purposes, using the analogy of the Sistine Chapel (one marvels at the size and beauty of it but it doesn’t need to be that big; that the awe and wonder derives from its magnitude) and so on.