Early Earth was under water...after the first flood. God destroyed all life on earth early on...Noah’s Flood was the second flood. After that, God put the rainbow in the sky as assurance that he would not destroy the earth by flood another time.
Read Genesis 1...
The fact that there is evidence of a previous creation us enough. The pre-humans, the Dinosaurs are evidence.
Does this mean that there was a fall of pre-man and that sin entered the world prior to Adam?