Your saying that the animals left the ark "2 x 2." This tells me that you are ignorant of Scripture. Perhaps you should read the biblical account before you trash it.
FWIW, Noah brought 7 pairs of each "clean" animal. It's likely that in the year or so that Noah and his family were in the ark, the animals had offspring.
Why has your knowledge of Scripture not changed since you were a child?
Q. What's harder than getting a pregnant Brontosaurus into the ark?
A. Getting a Brontosaurus pregnant in the ark!
(Noah! Make them stop. I'm getting seasick!)
I'm a christian in search of the truth. The noah myth was imprinted in your head when you were young. As Marilyn Von Savant(IQ 230, what's yours?)says: you can convince a 5 year old of anything, a 95 year old of nothing. As scientists it is our job to question EVERYTHING, even biblical "truths" to see if they stand up to close scrutiny, the noah myth is OBVIOUSLY a distorted account of a pakistani farmer, living in the delta region of the Indus River, being washed out to sea on his raft. He was expecting a river flood, instead he got a hurricane storm surge. The story then is a jazzed up version of a Camille Type event(in the 1960's in MS)long before written/recorded history.....You can continue living your child's fables, and believing the universe/earth was created in 4004 BC(an irish bishop's 1/2 a**ed scientific estimate)...or GROW UP and see the flaws of the past.