Absolutely right. There are of course definitions of free will that would grant us free will, like one could argue that a traffic light has free will, but there is no reason to believe that humans are not just reducible to a set of (complicated) biological processes. People of all religions and even plenty of atheists believe that somehow human consciousness is something special that transcends the material laws of the universe. That is what most people still seem to think, so it seems. Even I would dare to say that most people, including you, who know that this is likely false still have some deep rooted belief in the illusion. You may not believe in truly free will, but that is only the top of the iceberg part of your mind. The rest is deeply invested in the notion.

Interestingly Buddhists have as one of their central tenets that there is not only no free will, but not even a self. The idea of a self is nothing more than an idea. It has a function, but is inherently an empty construct. What it means to be a human can only be experienced in the moment. If one looks closely enough at that experience, the illusion of free will can be relented even at its deepest root. Paradoxically, I can report, this is incredibly freeing.