Free will is an illusion

Just like to define free will since I forgot to give a source on my opening argument. Definition- freedom of humans to make choices that are not determined by prior causes or by divine intervention http://www.merriam-webster.com... So my opponent seems to have trouble following why neurons firing equals free will. Well when I neuron fires, it causes changes in how other neurons fire, these changes in other neurons firing causes a chain reaction that can have an impact on a the decision a person makes. Now this change in decision is free will because it isn't caused by a prior cause. The effect of quantum mechanics happens in the present not the past thus isn't a prior cause. I feel some may have trouble understanding so I will give an example. Lets say we have two identical people in identical worlds, they have identical experiences, they have made identical choices in the past, they are even identical quantumly up to now. We now give them both a question. It is a question that the person may just as easily say yes as no. Now all prior causes have been identical, so if freewill didn't exist they would pick the same answer 100% of the time. They pick different answers sometimes because of differences in quantum mechanics in the present, not the past. So thus based on definition I gave earlier, there is freewill since decisions are not predetermined by the past. My opponent has accused my second argument of being weak. I thought it was clear from my wording that it was merely a theory and didn't prove that 'conscience' freewill exist, just merely gave the possibility that it could. The purpose of this debate was whether freewill is an illusion, if my opponent accuses a theory to be an illusion then I am guessing he would also accuse the theory of multiverse and the theory of a universe to both be illusions since there isn't evidence of one over the other. "Thus that which can be asserted without evidence can be dismissed without evidence." The research my opponent has gave is very interesting, unfortunately if you were to read the article you would find that it wasn't that a person never had freewill but that the brain has to prepare to make a decision. Quote-He concluded that we have no free will as far as the initiation of our movements are concerned, but that we had a kind of cognitive "veto" to prevent the movement at the last moment; we can't start it, but we can stop it.- end quote. (1) Notice that the sentence says that there is still a freewill to not make the movement, effectively the brain unconsciously ramps up to be able to make the movement, but then the person makes a conscience decision to do it or not. Quote-Basically, the brain starts to unconsciously churn in preparation of a decision, and once a set of conditions are met, awareness kicks in, and the movement is made.-end quote. (1) The person still has the free will to make the decision to press the button with the left finger or the right finger, but the brain unconscious ramps up before hand. Now my opponent has claimed that ."Now if free will was real how would it be possible to predict the actions of the test subject before they made them with as much as 90% accuracy it would be impossible." I feel that my opponent hasn't understood what his research is saying. The research is being able to predict when a person makes a decision, not what the decision is. You could be able to predict that in .7 seconds that a person will make a decision to push the button or not, but the person could still have decided to not press the button. There is a difference between predicting when the decision is made and what is the decision. Also if there was no free will, ability to predict would be 100%. I have not only proven that freewill exist as something not predetermined by prior causes, but also that there is a possible theory that 'conscience' freewill exist, even if the theory will be proven wrong in the future, as of now it is not illusional to believe in freewill just like it is also not illusional to believe that there is a multiverse or that there is only one universe. 1) http://io9.com...