If you wish to learn why we know that there was no flood I will gladly help you. And I can help you on some of your errant non-biblical beliefs as a Christian as well.
If you could prove that there was no flood you would have already done so.
And since you have professed to being a non-Christian there is nothing you have to offer in that category as well.
There is a public forum out there that welcomes agnostic's, hell huggers and blasphemous want-a-bees.
I strongly urge to to find this site. Once done you will find like minded folks you can relate too.
You will feel a "si of relief" knowing you have found your true home.
no animosity intended or implied
just a friendly suggestion