You completely sidestepped the substance of why I believe.
What you believe for reasons of faith I will not dispute.
If you look at my posts, I tend to discuss claims that can be addressed by science. The global flood at 4350 years ago is one such claim; the age of the earth at 6000 years is another.
If you believe that there was a global flood because the bible says so, I will not dispute that claim. But if you bring forth some evidence that you claim to be scientific in support of that belief, you may expect that I will address that evidence and its scientific merits.