> There is no requirement to "know a truth" to address the issue of free will.
How can I believe this to be true if you haven't proven to me that a mind can know a truth yet?
> The starting point would be: Come up with a definition that does not devolve into infinite regression ("god did it", which just moves the question "up one plane" and so does not provide a solution) or smoke and mirrors (and illusion over determinism).
How can I believe that it moves the question "up one plane" when you haven't proven to me that a mind can know a truth yet?
Etc. Most philosophers will cede to this line of reasoning and at best call it boring ala Russell and then continue from there. But they're doing the same thing that people that believe in free will do. They're either denying the battlefield or they're moving the goal posts or they're not coming up with a cohesive definition of a mind or a truth or what have you.
My point is that you can mock the free will folks all you want, but coming down on the other side of the argument is just as rooted in belief sans evidence. There is no proof or hope of a proof that a mind can know a truth that is not circularly reasoned so any firm belief that there is no such thing as free will is a delusion, short of maybe divine intercession.