Hm... this will get a little difficult. I promised to adress the quotes in your last post, but I also need to answer the relevant points from this one. Poor me... but I will try to get it into a coherent form.
The desire to do harm is what I was addressing.
There is no need to distinguish between different "desires". If a mechanism can be used for one desire: to harm, to not harm, to eat cookies - it can also be used for another.
I'm not arguing that 'free will' comes from some chance alignment of chemicals in my brain that in effect 'trick' me into believing my beliefs are genuine.
I think I see the problem in your reasoning.
First, the "alignment of chemicals in your brain" is not by chance. It is by reaction to outside and inside stimuli... as it should be.
Second, you make a false distinction between "the chemicals in your brain" and "you [...] believing my belief are genuine". The chemicals (and other neurological processes) in your brain ARE you believing. There is no seperate "you" doing some evaluations of what your brain does. What your brain does IS you.
The same objection must be made to the quote you gave as well:
As British biologist J. B. S. Haldane wrote in 1927, "If my mental processes are determined wholly by the motions of atoms in my brain, I have no reason to suppose my beliefs are true . . . and hence I have no reason for supposing my brain to be composed of atoms."
His mental processes are not determined by the motions of atoms - or whatever neurological process you want to mention - they ARE his mental processes.
His - and your, I´d say - real question of course his: if thinking is chemical, mechanical, electrical... how do I know it´s reliable or true?
Here we have to distinguish between the "reliable" and the "true" part. We have established that our mental processes are quite reliable. They are not random, they are based on outside influence, and they can be checked for consistency.
And because they are reliable, we also know that they are not "true". The picture they present us of "reality" are based on their limited structures. By expanding these structures - using different, non-human means of observation - we have found out that there is a lot more to the world than we would think... would we limit us to our biological equipment.
That's like saying the United States is responsible for you voting Republican - because they give you a choice, including not to vote!
Hm, so I may have misunderstood your earlier posts. I though you were arguing that the "desire not to harm" comes from God, while the "desire to harm" comes from "free will".
Are you saying that both desires come from "free will" and that God´s part in that is limited to "giving" this free will?
This would remove my earlier objections. As I (mis)understood you, you would, in this example, have argued that the US is responsible for me voting Republican, but if I vote Democrat, my free will is responsible.
Yet, even attributing these choices - harm/not harm, republican/democrat - to free will does not answer your initial question: where does that desire come from.
I choose republican or democrat, by free will. But why? Why the one, and not the other? What determines that choice? Not asking for a cause would mean that "free will" is arbitrary, random. I choose rep/dem by internally "tossing a coin".
Do you believe that?