Or even simply bound to the premise that some Bible or other, or some subset of it, is factual. If you agree to allow that premise you can only look for contradictions within the Bible (or said subset of it) to debate. Any other evidence can easily be "proven" logically to be yet another coincidence, and given that nothing in science is absolutely proven, you simply cannot expect to win by bringing science into it, without getting agreement from the outset that the debate will be based on scientific methods.