Sorry I'm just getting around to responding Downeast. I certainly can't speak for other Christians, but I think it is certainly fair to apply that standard to Christians as well, and I don't think it would cause a problem. While it's true you'll hear some Christians say "I know there is a God," most readily admit their philosophy requires a bit of faith, which is a necessary foundation for a Christian. In fact, I don't remember specifically ever hearing a Christian say they could prove that God exists (though I am sure it happens). One of the big differences between the thought processes of theists and atheists is that theists admit (and even celebrate) that their worldview incorporates a bit of faith, whereas atheists almost always put themselves as far away from the word "faith" as they can get. "Atheism is a lack of faith" is a common line. Yet logically, we see that is not true, as the atheism worldview also takes faith. This idea that atheists don't have faith allows them to think they deal in "fact" while theists deal in "opinion," but that is not the case.
As for the flood, Earth age, and dinosaurs; I personally would not be confident enough to say "we know what is factual." I think we could have whole degree programs on all those topics so we will not solve them here and I certainly don't have all the answers on all those topics. We could quibble from now about how many animals Noah would have needed, how the ark could have been built soundly enough, fossils and carbon dating, etc. As I stated earlier, I think they are interesting topics to discuss but they are not essential for belief in God or Jesus or salvation. I seriously do not think (I may be wrong) God will ask us how old we thought the Earth was or if we thought dinosaurs and man lived together as a qualification test. John 3:16 gives a good summary of the essential tenets of Christianity. "God, love, begotten Son, belief, everlasting life."