Dude, you become so incredulous that it becomes very apparent you don't even know what you are talking about.
By what measurement or historical publication do you come to the conclusion that the supposed ark weighed 8100 tons?
And from where did you draw your conclusion that he had 7 days to do this all?
If I had one of your supposed bullshit detectors, I can't imagine that it could keep quiet while your hands were on the keyboard.
People whose blood pressure spike through the roof and fly off the handle at the mention of a bible (or a koran for that matter) strike me as much more amusing (dare I say foolish?) than people who genuinely believe the literal accounts of their respective religious texts.
If your goal is to get a religious individual to reassess what he believes given facts, maybe you should present facts and let them come to their own conclusions.
If your goal is simply to make yourself sound absurd, keep on keeping on.