Both the Creation account (4026 BCE), Adam & Eve etc, and the Flood, are allegorical tales that were handed down by word of mouth over millennia. The fact that Jesus, if indeed he existed, spoke about these events is purely for the reason that ordinary people would be familiar with them and understood the meaning he was putting to them.
Personally I do not believe Jesus was in heaven at any time or had any part in creation. These days I am an atheist. In fact it was research into the flood story and subsequently creation and then 607.... and the pack of cards just crumbled.
There is so much evidence for humans thousands of years before the so called creation account that even uber-JW Sis England no longer argues against it.
George