I agree with this. It would be crazy to suggest that the events narrated in Genesis occurred exactly as they are written. I am not advocating a literal interpretation of Genesis as some Christian Fundamentalists suggest. Genesis is not a science book.
Genesis should not be read literally. However, it does contain truths, and I personally believe one of these to be that humanity is descended from a single set of parents. I do not know what these first parents were like, and I am not suggesting that they were fully formed modern homo sapiens. I believe in Evolution and I believe that humanity has evolved from these single set of parents. I subscribe to Theistic Evolution or Evolutionary Creationism.
I struggle to understand how Catholics can say they do not believe that humanity is descended from a single set of parents, which the Bible calls Adam and Eve. The Catholic Church teaches the doctrine of Original Sin. Death entered the world through Adam, and life entered the world through Jesus Christ. God created humanity in a state of original holiness and justice, and through the sin of the first man, death entered the world. The Second Person of the Most Holy Trinity assumed human nature to restore the human race. He came so that we could be made sons of God, receive his divine nature and have eternal life.
If Adam never existed, then Original Sin is not true. If Original Sin is false, then humanity had no need of a Saviour. Belief in the reality of Adam and Eve underpins the entire Catholic faith.