The concept of "choice" contradicts determinism and causality

In this debate, my opponent will argue that choice is a possible concept within a deterministic and causal universe. I will argue that "choice" is impossible. I recommend very strongly that my opponent be well-versed in the philosophical schools of empiricism, skepticism, epistemology and natural science.I will use my first round to define the words "choice, determinism" and "causality" for the sake of this debate. I am willing to hear semantic arguments about these definitions since the issue is whether or not the three words fit into a logically consistent framework. Causality is the simplest and most fundamental concept, so I will start by defining it as 'the concept that every effect is the result of a prior cause.' Causality is an idea that results from observation, therefore it is limited to being valid within a philosophical framework of empiricism. I am a skeptic, so it is important to note that I regard any "knowledge" resulting from empirical observation as suspect. To me, even the idea of causality is an assumption based on imperfect evidence. It is doubt-able. However, I also believe that a non-causal universe would dis-allow even the possibility of 'knowledge' so I go along with the assumption of causality for the sake of being able to pass my time having discussions. If the universe were not causal, I could not have discussions that made any sense at all because causality is one of the three essential assumptions of epistemology - the theory of knowledge. If it not assumed, then "knowledge" fails. *Causality is also an essential assumption for the notion of determinism. Determinism builds on the notion of causality by asserting that 'every effect has a prior cause which is consistent.' Gravity always attracts, electrons always repel each other, and a free neutron always undergoes beta decay in a mean time of ~15 minutes - these are examples of deterministic thoughts. Like causality, determinism underpins all of the natural sciences, and epistemology as a whole. Lastly, and perhaps most importantly, I will define "choice." Choice is the notion that a system of awareness could have any degree of freedom over its actions in a causal and deterministic reality. This idea, I argue, is inconsistent with the ideas of causality and determinism. One cannot logically accept all three notions. In order to effectively argue this debate, my opponent is going to have to either challenge the semantics of my definitions for one or more of these words, or explain how any degrees of freedom could exist in the actions of a being that exists in a causal and deterministic universe. And although it falls out of the initial scope of my terms, I will even accept an argument that the universe is not deterministic and/or causal, and that the concept of "choice" is somehow feasible in an indeterministic and/or non-causal universe. * I also think it's important to note that I do think its possible that our universe is random, even given the framework of human observations. I will use a dice analogy to explain: lets say I have 6 die and am rolling them to see if I can get the sequence 1,2,3,4,5,6. I roll them a dozen times or more before I finally get the sequence, but someone who has never used dice before walks into view just as I roll this sequence. They make the hasty assumption that this must be the way dice behave all the time; that they roll around seemingly randomly, yet come up in sequence. In this analogy, our universe is the dice roll that came up in sequence, and we are the observer that arrived to witness it happen. This being the only universe we have witnessed, we have no other examples of how universes behave and have decided that it only makes sense for universes to be ordered or causal like this. But we might be wrong. If time is eternal and the universe is non-causal (i.e. random), then some universes would inevitably arrive at ordered patterns, and any observers in those versions might naturally assume as we have, without any proof beyond our observations.