because you say so.
Instead of plate techtonics creationists have “hydroplate” so called theory.
Instead of astronomy creationists have God “stretching out the Heavens” to account for the billions of light years.
Instead of half-life decay rates to detect the age of objects creationists have “you can't do that!”.
Instead of archeology and linguistics and human genetics to explain differences between human populations creationists have the “Tower of Babel” and the “three sons of Noah”.
Instead of paleontology creationists have a “Global Flood”.
Creationists oppose science because THEY say so Mr. B.