Science hasn't quite caught up to God's way of doing things yet. For eons, science kept insisting the bible isn't true because the bible says God created light---before He created the sun. So therefore, that obviously is wrong. Had to wait a long time for science to figure out there is invisible light---invisible to our eyes, not to God's. Light is not just sunlight.
"The human eye can only see optical or visible light. Light comes in many other colors -- radio, infrared, ultraviolet, X-ray and gamma-ray. Astronomers can get more information about stars and other distant cosmic phenomena by using instruments and telescopes which can detect these different types of "invisible" light."
http://lithops.as.arizona.edu/~jill/EPO/Light/invisible.html
It is, of course, foolish to think anything can be created by the power of a voice----God speaks, and it is a fairy tale. Science is just getting into the power of sound--
"The sound waves are mechanical waves which are created from vibrations between the particles of the medium. When it is moved through the medium of air then the air particles are displaced by the moving energy of sound waves and wave is travelled. But it can also be a longitudinal wave like in vibrating tuning fork which creates waves from vibrations."
http://physics.tutorvista.com/waves/sound-waves.html
Now they're saying, that sound can not travel in a vacuum so God couldn't have created by voice as sound can't travel in outer space----sounds that they know of. As with light, there are sounds the human ear can't hear. It wasn't that long ago that everybody laughed at a silly dr that said there were invisible things that cause sickness and we need to wash our hands in between patients. Then they discovered germs. Little by little science is catching up---so I'll wait and see what future discoveries reveal about what they think God can't do. It changes.