Well we do know for a fact that two of every species was not placed onto an ark. We also know for a fact that there has never been a flood that would cover the earth in anywhere near enough water to make Mt. Ararat a landing place for the ark. There are literally countless examples of errors but I don't think I need to dig out my Bible do I?
The Flood? Really? What year was the flood? Ever hear of literal Biblical Scholars and a Regional Flood? I've even read anti-flood anti-religion papers that allow for a literal interpretation of the text in its original found texts that allow for a regional flood. They knew that was a losing argument. Same with "kind" and land species. As for the topography of the earth. Once again, ever read the regional flood scholars? Ever consider divine changes in topography in order to support the future separation of races and civilizations?
Ever hear of a miracle? I can tell you water cannot be made instantly into wine, but this will not disprove anything to a Christian. How many "kind"'s of land species were there at the time? Can an angel kill thousands overnight? Can anyone? I am trying to say that this is not how you disprove the Bible. You are too easily refuted and going for what you perceive to be low lying fruit.
This is why you lose the argument.
The historicity of the Bible would have to be attacked showing archaeological proof that the Bible says X and this proves Y. Otherwise you once again speak to a brick wall. I am trying to show how to win the argument and not feel like you are hitting this wall.
Prophecy is the real trick. Find a prophecy that was not fulfilled and you have something. By the way do not point to when Jesus says about his return before this generation passes. A first year Bible student can show you the texts and definitions and easily prove to you Jesus was talking about the generation that saw the signs he was talking about, not the current generation. This I covered in a previous thread.
So many think that Christians are stupid. Well guess what, many are. They are ignorant to the foundation of Christianity. But so are most of those against Christianity - The pathetic YouTube videos and even lectures by anti-religion PhD's are sad. They all talk like they know everything and yet could not hold a minute when confronted with the scientific examination the Bible has been under for decades.
Prophecy is the cornerstone. Find an error and the house tumbles.