So you agree that the bible stories aren't true? So what are you asking me to prove?
So how did Noah get marsupials from Oz and back again?
Some people's faith is such that they believe the King James Version of the Bible as published in 1611 is how God meant us to understand creation and scripture. Many others--most, in fact--are cognizant of the fact that English cannot do the original Hebrew justice.
In the example of Noah's flood, a more accurate translations today would have been, The dirt/earth was covered with water--not that the planet earth was covered with water. In the original Hebrew the reader would picture that earth--as far as could be seen--was covered with water. (Imagine horizon to horizon.) In the King James English, suddenly the entire planet is covered with water.
Over and above all this, the lesson in the story had nothing to do with how far the water extended.
What I would like people to know is that there is a supreme being who loves us beyond our capacity to absorb or fully understand. There is the chance that anyone can have an interaction with this God of love. Noah did, Abraham did, Moses did, David did, Samuel did, I did, and so did many, many others--so how hard can it be? Really, really hard if people are more interested in how much water covered the land than they are interested in actually encountering God.