Why refute it? It's the circular reasoning of an unsound mind.
The answer is of course all of the contradictions between various versions of different "holy" texts. Which is the infallible version? How can you tell which version is infallible? If something is proven false or contradictory within the infallible version, how would you reconcile that? And if none of the holy texts are infallible, how was the message corrupted? How did something incorrect become a part of the holy text? Mistranslation? Mistake? Deliberate editing for personal or political machinations? If one of those is possible, how can you trust any of it?
A believer of any faith will not find this argument convincing, and a non-believer will find this conclusion obvious.