Wikipedia had some great text on Burden of Proof in an argument:
"Internet personality
Matt Dillahunty gives the example of a large jar full of gumballs to illustrate the burden of proof.
[12][13] The number of whole gumballs in the jar is either
even or odd, but the degree of personal acceptance or rejection of claims about that characteristic may vary. We can choose to consider two claims about the situation, given as:
- The number of gumballs is even.
- The number of gumballs is odd.
Either claim could be explored separately; however, both claims tautologically take bearing on the same question.
Odd in this case means "not even" and could be described as a negative claim. Before we have any information about the number of gumballs, we have no means of checking either of the two claims. When we have no evidence to resolve the proposition, we may suspend judgment. From a cognitive sense, when no personal preference toward opposing claims exists, one may be either skeptical of both claims or ambivalent of both claims.
[14][15][16] If there is a dispute, the burden of proof falls onto the challenger of the status quo from the perspective of any given social narrative.
[17] If there is no agreeable and adequate proof of evidence to support a claim, the claim is considered an argument from ignorance.
[18]"
Philosophical burden of proof - Wikipedia
So what it is saying, in my opinion, is not only should we generally suspend judgement when a side fails to prove itself, but if there isn't proper proof or evidence to support Christianity when the Burden of Proof is on it, it becomes a Logical Fallacy crudely named Appeal From Ignorance.
How would you refute that Christianity can't be properly proven or the specifics of what Wikipedia said?