Darwinian evolution is 'a priori' atheism, i.e. without God.  The struggle for survival, the survival of the fittest, this competition among species is both the 'designer' and 'will' in Darwinian evolution.  

Poor Charles Hodge.  What else could the arch-conservative, strictly orthodox, Calvinist do?  He was 62 when Darwin published his 'Origin of the Species.' How could he know that Darwin's motive force of design had no basis?  What else but atheism could a thinking man conclude?  All the enlightened thinking about evolution that replaced Darwinian Evolution had yet to be imagined.