Did Genesis 6 chatper tell you? Wasn't Genesis 6 chapter the final judgment? Mmmmm.mmm.. God won't know but people knew it will come. My time is not come but their time is come. I rest my case.
(Genesis 6-9) I don't think you understand the bible. God looked upon the earth, seeing all the people turned violence. God said to Noah,
"The end of all flesh is come before me; for the earth is filled with violence through them; and behold, I will destroy them with the earth. Make thee an ark of gopher wood; rooms shalt thou make in the ark"
Then God told Noah what He was going to do.
"And, behold, I, even I, do bring a flood of waters upon the earth, to destroy all flesh, wherein is the breath of life, from under heaven; and every thing that is in the earth shall die."
the reason for it all is because humankinds were killing, robbing, stealing, lying and sinning. Only Noah was faithful to God.
That was not the final judgement day.
The Bible says that Noah was a preacher of righteousness but nobody listened to him. Nobody believed that God would destroy them. They were very wrong. They had years to repent and follow God, but they would not. It's the same as today, some people don't believe in hell, one day they will be very wrong just like those people during the Noah's time.
The bible does not lie, God does not lie. It's the people who refused to listen, it's the same as it was in the past and it still the same as of today.
The final Judgment day will come, and nobody will know, only God.