---AND a Darwinist?
That's an odd linkage. If Darwinism is correct, you are merely a complex result of positive and negative charges in combination over time. In essence, a very long number.
Freedom must come from somewhere outside of nature, else it is an illusion.
Ahh! Brain chemistry! An interesting point that you bring up, which I would be delighted to discuss with you.
Human neurons contain channels that each contain a single, positively charged ion of potassium.
According to quantum physics (Heisenburg's Uncertainty Principle, to be precise), an observer can know either the position of a single particle or its state, but never both.
Take a few genetically pre-determined dispositions, add life experiences, and THEN throw in this quantum randomness and multiply it by a trillon (roughly the number of neurons in a human brain), and you've got a fully conscious, self-aware human being with a will of his or her own.
The unpredictability of the functioning of the human brain throws any kind of determinism right out the window regarding, as you stated, "a complex result of positive and negative charges in combination over time".
In other words, we are not organic robots and predestination is a lie, thanks to the laws of quantum physics working in our nerve cells.
"Are life and consciousness connected to the fundamental level of reality?" (link pops)