Of course all my deliberations are due to the person I am and the outside influences and circumstances.
Good. And those two things together determine every thought and outcome.
The question is - what comprises the person I am?
In practical terms, it's the way you think, your likes and dislikes, your abilities and knowledge, your education and experience, as well is your basic nature (genetics, and any nature you think a soul may come with, if you like) - all the things that make you a unique person.
If I am merely a part of the continuum of this physically determined universe...
The logical argument against you is not about the physical universe. Misrepresenting the argument against you is a sort of lying - please stop it.
...then everything I choose to say, do or think is entirely driven by physical reactions over which "this person that I am" has no personal influence, so I can take no personal credit or presume any personal accountability for such physically driven reactions.
Even if this wasn't confused nonsense, it would be yet another
appeal to consequences fallacy. What is it with you and fallacies? Don't you think they apply to you or something?
Anyway, you've already agreed that any choice is the result of the person you are and the circumstances. You cannot change either of those things regardless of how the person you are got to be they way it is. If the person you are is the result of chains of cause and effect or reactions (
not necessarily physical), that doesn't mean that the person has no influence. It is
exactly that person that is making all the choices.
I don't understand why you don't get this. You are the way you are and you will always make the choice the person you are would make in the circumstances at the time. Being "free" of these "constraints" doesn't make any sense at all - regardless of whether the person you are is the result of chains of (
not necessarily physical) cause and effect.
And, no, the "cause is the will of the human soul" is not a way out of this. A (
not necessarily physical) cause that isn't itself a (
not necessarily physical) effect of some previous (
not necessarily physical) cause must be random. Anything that changes state over time (anything that makes choices) is either a
deterministic system or it isn't (and involves randomness).