AB,
I appreciate that from a materialist point of view there can be nothing other than deterministic physical actions which invoke our choices, but the spiritual dimension offers more freedom.
But your problem is that you have no reason to think that there
is a “spiritual dimension” in the first place. Once you just assume it though, then of course it offers “more freedom” – you can populate a world of illogic with any guesses you like and call them “true” to your heart’s content if you really want to.
You do not seem to understand what I believe to be the nature of the human soul, so this is my view:
The spiritual awareness of the soul is not a physical thing built up from the data held in brain cells. It is just conscious awareness of the content of the physical brain, and its interaction with the brain is controlled by the conscious awareness itself, not just by what it is aware of. So the ultimate choice is based on the will of the conscious soul.
Your problem here isn’t that others don’t understand it, but rather that they understand the problems with it better than you do: you have no good reason to abandon the current paradigm of explaining consciousness as an emergent property of brains, so there's no need for an alternative explanation at all; you have no coherent definition of ”soul”; you have no logic to support the notion of a “soul” as a necessary phenomenon; you have no evidence for a “soul” even if you knew what you meant by it; and you
still have no way to free this "soul" from itself being deterministic in character if it isn't just to fire off decisions at random.
In short, your belief is just that – a
belief, and moreover it’s one that flatly contradicts the available logic and evidence that we do have.
Incidentally, inasmuch as your notion that there must be a control mechanism to mediate the instinctive one, what you’re actually describing when you say “soul” is the pre-frontal cortex, which performs tasks broadly aligned to those you ascribe to this supposed “soul”.