Why is there no record of ancient humans? 1. Because humans aren't very ancient, after all. 2. Because of the destruction that took place from Noah's flood.
According to the Bible, it was not Noah's flood. It was God's flood. Noah just built the Ark to survive His flood. Sheesh. You cannot even get that detail correct? That is very very telling on your mindset about Judeo-Christianity. It means you are a Bible-thumper, not a Bible thinker. There is a HUGE difference.