Man has measured the speed of light, and also knows about the Doppler effect that for electromagnetic waves like light is valid, produces a red shift in the spectrum of light, also has measured the distance starts and galaxies are from us, and has concluded that the stars are so far away that the distance for its light to travel space and reach us is measured from the closes start "Proxima centaury" 4.2 light years away to The galaxy MACS0647-JD about 13.3 billion light-years from Earth.
To say that God created the Universe 6000 years ago, goes from fanaticism to Ignorance passing trough adjectives I dear not to mention.
And I have not even mention, evolution, fossil record, embryonic replay, recessive genes, geology, seismology, mantle tectonics, radioactivity, Galapagos island, the volume of water volume in the interior of earth, has to be less that the water in the exterior, water in the interior is very hot and will came out with lot of steam, and if busted in one instantaneous event like young earth theory will steam cook Moses and his ark.....too much to say.