Actually, I understand how skeptics could twist the flood (or anything) to look like a failure, as easily as I can understand it (in my mind) as a success for the human race.
Consider that lots of wicked people were wiped out by the wrath of God, and these people were not the ones sinning after...
Of course they were different people - physically and spiritually. They weren't the ones that died in the flood, that's for sure. :)
Or did you just mean that the post-flood people have sinned (profusely, even) just like the pre-flood people did?
Well yes, ALL have sinned. But does this...