@dipplayer, i don't know that this is a tenant of humanism, this is probably more materialism.
What the word soul means, in a metaphysical sense, would determine whether or not i think you have one. You might think my philosophy is de-humanising, but my life philosophy has developed to extend my empathy to animals, and become a vegetarian (to minimize suffering, as i believe factory farming is cruel) - that is, it has lead me to being more considerate of others, even others which most people ignore - though i'm not going to claim that most people would directly torture an animal, but they allow it to happen which i think is morally lazy.
Anyway, i think this empathy is a very human thing, and don't find it de-humanizing at all. The logic and rationality which i base my philosophy doesn't discount the actual human experience. The experience of suffering is a key assumption/basis of my philosophy; and the cold rational logic is merely a tool to suggest the best way to behave in this world...
@CA:
I guess it is the 'free' part of free will, you are constrained to act based on your personality, your environment, the incentives you perceive, etc.... basically all the things that make you up. I guess you could sum them up as a set of rules, then the illusion is that you can't see the rules.
Of course you can come to understand your rules and by doing so expand your options... but then you're changed your rules by adding them to your experience, and forming new rules which you can't see. I think it is a fundamental physical limit of any processing system. (something analogous to Gödel's incompleteness theorem, or the stopping problem)
I guess to avoid the brain checking if it's decisions are the best ones by looking at the rules, it just hides the rules from us, and lets us feel like we're making the decisions. That's like a formal mathematical system where you can do whatever calculations within the system you want, but none of the processes all the system to change the rules (where the rules define what processes are)
In that sense, the things the brain is intentionally hiding is the illusion.