Because that, when they knew God, they glorified Him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
Romans 1:21
" ... another common misuse of evolutionary ideas: namely, the idea 
that
some trait must have evolved merely because we can imagine a scenario
under which possession of that trait would have been advantageous to
fitness... Such forays into evolutionary explanation amount ultimately
to storytelling... it is not enough to construct a story about how the
trait might have evolved in response to a given selection pressure;
rather, one must provide some sort of evidence that it really did so
evolve. This is a very tall order.... "
Austin L. Hughes, The New Atlantis, Fall 2012