No, far from it. Genesis is one of the most literal parts of the Bible. The best interpreter of Genesis was the late Zechariah Sitchin who took literally chapter six of Genesis, with the "sons of heaven" coming up and down from the earth to "know the daughters of men" and produced offspring who were half-giants, fathered by the angels. We know that there were real giants because, much later, David slew Goliath who was a giant;and, when David was later made king, he selected those Moabites captured in battle to be slain because they showed characteristics of giants. Read Zechariah Sitchin's writings based on this realisation, such as "Divine Encounters". It explains how humans came into existence.