I think we all understand that, but most of us would see that as a problem. By putting your greatest confidence in your faith, you basically are saying that anything that contradcts your faith can be dismissed.
With respect to the flood, someone could point out impossibilities in the flood story all day long, but it goes against your faith, so it wouldn't be persuasive to you. You could hear the arguments, and have no counterarguments, but your real confidence would remain in your faith, and so you would simply brush off whatever arguments you've heard.
There's a similar pattern in your bigfoot sighting. "I am very confident in what I saw." The fact that an undiscovered large mammal living so close to humans would leave certain evidence behind, and no one has ever found that evidence despite intense search, is irrelevant. You saw something, and you know what you saw, so there must be some explanation.
There's a certain egotism involved. You know what you saw, so it must be true. You know what your faith tells you, via the Good Book, about the flood, so it must be true.
However, the rocks of the Earth also tell a story, even if it is more difficult to interpret than the story in Genesis. Your faith tells you that God authored the story in Genesis, but men were involved in the construction and preservation of that story. Not so with the rocks. The story of the rocks was authored by the creator of the universe alone. Perhaps you should listen to what they have to say.