Torri,
The terms physical and material are entirely relevant. As you correctly surmise, if all our brain activity is determined by the physical reactions of material elements then we have no control over our brain activity because it is all pre determined by the laws of physics and chemistry acting on the material entities of our brain.
But I have the freedom to drive my conscious thought processes and the freedom to consciously put into action the results of these thought processes if and when I wish. Of course there is a reason for every action I take, but where and how does that reason originate? I have used this freedom to take many forks in my path of life which has led me to be a devoted follower of Jesus Christ. And I have the freedom to pray, and the freedom to choose which prayers I make. I also have the freedom to reject God if I so wish. In essence, my freedom has made me what I am. The uncontrollable reactions of material entities could never have done this. I can only conclude that my freedom is determined by the ability of my soul to consciously perceive and interact with my physical brain.
This idea of a soul that you insist on promoting, quite simply you can't just assert a soul into existence, it sounds like a very nice idea for you but you haven't to this date managed to put forward anything that approaches even a modicum of viable evidence that supports this idea that definitely does exist inside your head.
By the way I don't and never have rejected this god idea of yours and your associates, I've yet to see any good reason to take this god idea of yours up in the first place to be able to then reject god as you put it.
If there were any viable evidence that could or would support your god idea, at the moment just an idea, how come there has never been anything about 'irrefutable evidence for the existence of god found', published in or on the media blasting out everywhere and if In the unlikely event of this viable evidence ever being found, oh no , we'd never hear the end of it 24/7 from all of the goody two shoes religionists, perish the thought.
Were the evidence to be found I would be somewhere as near as devout as most, without going over the top because even if this god of yours did exist I doubt he she or it would be that keen on some of the wet sounding brown noses we endure and read about, any more than the rest of us do.
ippy