The answer
to this is found in the Epistle to the Romans: "Because that which may
be known of God is manifest in them; for God hath shewed it unto them.
For the invisible things of Him from [or, ever since] the creation of
the world are clearly seen, being understood by the things that are
made, even His eternal power and Godhead; so that they are without
excuse." Romans 1.19,20."
E.J. Waggoner