Posted this here originally, then thought it'd be good content for this blog! It's kind of an arguement against an arguement you might not even have heard yet. So perhaps a solution for a problem you don't as yet have, but hey!
"Humans are fundamentally bio-mechanical"
Think of it this way - if you trying to look at yourself as a machine, your using an anthropomorphism. You are not complex enough to really grasp how complex you are. So you use a lousy, weak ass idea of 'machine' to fill in for your incapacity to be complex enough to percieve your own complexity.
This extends to the idea that at some point there was a big bang, and your still part of that ongoing bang - and that bang is still a big ass mystery. So you, as an extension of it, are still mysterious. Quit looking strictly at the short term and just whats happened in the minute lifetime you've been in, to try and identify what you are.
Don't confuse the weak ass model your mind conjures up, for what your mind actually is. Sure, you can debunk ideas of free will (free from what, is my question), but so can you debunk 'OMG, I'm a machine'. Neither is some real, genuine grasp of the situation. They are both weak ass approximations, like a fuzzy JPG of the Mona Lisa. They don't show the true picture.