To me, either proposition seems to be
unfalsifiable (whether evolution occurred solely by
naturalistic means or whether it was helped along is
impossible to test). However, the anthropic principle makes
little sense as well. It seems to me that it is just as
great an improbability to hypothesize an intelligent
actor which chose the set of circumstances resulting in
humans as for those circumstances to arise by chance.
All it does is push the question back a
step.
My three cents,
Nathan Freeburg