I think we can all agree that excluding the notion that thought occurs in some magical plane, thought occurs physically in the brain. The brain is either completely subject to the strict physical laws that everything else in the universe is, or our idea of physics is completely wrong. If everything exists only physically and the laws of physics are real there is no free will.
What if the laws of physics aren't true? Well then we have no control. Action doesn't result in a reaction (keep in mind that thinking and willing are actions, too). We aren't capable of causing anything to happen, and that is the definition of free will.
Quantum mechanics?
A. Either it's not really random, or you can't control it. If you can't control it, it wont help any free will argument. If you can control it, it doesn't have any special properties, so it is covered in the argument that applied to all matter.
B. Even if you could control indeterminate quantum particles, you wouldn't be any freer. The results of your actions/choices/willing might be indeterminate, but those actions themselves would be just as determinate as anything else.
There is no reason to believe that there is any magical spiritual plane that exists precisely to enable the thoroughly debunked delusion that you naturally believe in as a human. If you believe in God, you could also pull the "LOL HE CAN DO ANYTHING" card. But neither of those ideas have any more validity than the "Pink bunnies baked the universe into existince inside a giant easy-bake oven" theory.
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