Emeth, are you seriously saying there was a cavern filled with enough water to flood the world, then the cavern was was emptied and after 40 days it filled up again?
When you say it's peanuts for god to do, it's more likely peanuts for your brain to consider such non,..sense.
You are clutching at straws with that reasoning.
Obviously you are resorting to the god must have mentality and by so doing are insulting your own intelligence.
It is an ancient story which has been proved to be an absolute impossibility.
Only time may bring you to understand this .I hope someday you will find that clarity.
Best wishes to you.