Yes people did exsit before Adam and Eve. I have some pictures of the people if you want to see them? They were fallen angels but married people from the world and created children which is one of the reasons for Noah's Ark and the flood. They were giants.
It is a really interesting and fasinating study. Pastor Chris did a preach on it some time ago .
I hope this has helped.
Adam and Eve had children and their children had children. It was not wrong in those days. It was how they made life.
The world now a days is so currupt the man and woman of the same family could not have children. Adam and Eve only started to degrade when they fell so their bodies only started to fall into death, they could still have children and their children could join with each other because sin had only started in their bodies. It is a different story now a days as the human body is really bad and full of sin.
I hope this has helped
E-mail me if you want to.
There is alot of Bible teaching that backs me up.