I take that seriously rather than literally. If you don't take that seriously, you won't take anything else seriously. Any attempt to interpret the creation account "spiritually" is a compromise to suit the EVILutionary view. Jesus said heaven and earth will eventually pass away, my word will never pass away; however, if you believe that they were "billion years old", then that's an incomprehensible number that's almost equivalent to eternity, which implies that they will never pass away, while Jesus's words were first century myth that ought to pass away. That's typical 180ism from Satan, turning white black and black white, up down and down up.