@fresco,
Therefore, if i follow you, all realism is naive. You might as well drop the 'naive' qualification then, which is nothing short of an insult.
What's your theory of origins? Whence do humans come from?
Ps: epistemology is the best branch of metaphysics, the one that grounds knowledge in empiricism, tells us what we can and cannot know scientifically, and calls for parsimony beyond empirical facts. It's essentially a critique of classic metaphysics from the inside, asking 'what do the facts tell us?' and answering (in short): 'not as much as we often assume, so let's stay away from grandiose unsupported claims'.