Less than a hundred pages ago, in this thread, I told how a bull ran at me one day. We were trying to load him on a truck to go the butcher, and I suppose I don't have any reason to think he should like that. He bolted and ran a tight circle, and picked the spot where I was standing to head for the wild blue-sage yonder. I had about one second of eye-to-eye contact before he shifted his eye to his right and I knew that was where he was gonna go. I jumped in the other direction to safety, so to speak.
That bull didn't want to run me down. I call that an example of "will". Maybe it's just wanting an easier path. But I've seen some creatures who preferred the harder path, too. I see what I call "will" in birds, even snakes. Who knows what "programmed" reflexes/chemistry phenomena in nature could explain it.
I see willful disbelievers in "God" as much as I see willful believers in "God". Many in both of these "choice options" can talk about "reasons" for their choice, some at great length, but I sorta take it that the reasons take second seat to "will".