@litewave,
Forget about the layman's terms "belief" and "reality"! The "naive realism" to which those words refer involves the idea that there are "things in themselves". Contrary to that simplistic idea, Thomas Khun's celebrated "The Structure of Scientific Revolutions", reinforces the view that things/concepts are better understood as interconnected
nodes of communicative significance within epistemological networks rather than separate ontological entities in their own right. For example "an electron" has "existence" by virtue of its relational connections with
all aspects of chemical, atomic, and electromagentic theory. Thus entities
exist by virtue of their
utility, within sub-domains of social interaction called "paradigms".
So once again, ( hopefully for the last time), within the paradigm of social dynamics the term "free will" has
existence by virtue of its interconnections with other terms like "responsibility" , "liberty", "morality" etc. By challenging the
utility of one component you challenge the whole paradigm.