Which Elements in Genesis 1-3 Existed Literally? Do Figurative Elements Negate Theological Truths?

Was there a real, literal garden of Eden? What about the tree of life, the tree of the knowledge of good and evil, and the serpent? If some of these elements aren't literally real, would that negate the theological truths of the narrative, or even of Christianity as a whole? Dr. Craig answers these questions head-on!