firstly, evolution has been observed, both retrospectively and
actively. There are various evidences which supports the theory of
evolution, such as bacterial adaptation, natural selection etc etc.
Retrospective evidences includes examination of fossils. For
example, homosapiens are not known to predate homo erectus, who in
turn are not known to predate neanderthals.
Creationism, on the other hand, cannot be proved using scientific
methods. Most of its arguments centres around the existance of god,
which is in itself, another topic altogether. The trouble with
taking the bible to be proof and evidence of creationism, is that
one would constantly be looking for evidences within an already
dubious source, resulting in circular arguments.
