I think of the mind as the brain, running the body, processing information that comes to us through the senses. As for your leaf: Was their a bug or other life on the leaf? Was the leaf growing, receiving/processing nourishment? Was it quantum physics? Interactions between atoms and molecules? To find out, we explore, we observe.
When the brain/mind presents us with several courses of action, which part of us decides? That is what I consider spirit. Others may argue, no, the brain sends all information to a specific portion of the brain, and presto, out comes a decision, no spirit involved.
We do. The problem with religion is it often ignores what's there, and replaces it with something else. Like when Galileo got arrested for something that had been know before and would be proven as right later on.
So, you think the spirit is what leads to independent thought?
Well, it's interesting because how many people actually have "independent thought"?
The easiest way for me to explain is from the MA flight that got shot down over the Ukraine. The Dutch picked up all the pieces. The Russians had said it was shot down by a air to air missile. The Dutch proved it was from a SAM, and they even knew the type of SAM.
Why? Because when you have an explosion, the moment it happens, everything is inevitable from that moment on. You can't change anything, there's no choice going on. This energy is going in that direction at that speed, this other energy is going somewhere else, it'll hit other energy with a certain speed. We know what will happen, and we can work backwards and figure it out.
We could do the same with the universe, IF (huge if) we could get all the energy and figure out what it's doing and work backwards.
As a human, you will like certain food. Why? It's the old nature v. nurture, what your body tells you to like and what you learned to like. With hobbies it's the same. With everything it's the same.
I write on here because of the type of person I was born as, and because I've learned, since 1999 when Columbine happened, to do it. Am I really in control. I could choose to stop, and I have (at least on this forum, rather than on the internet) to a certain extent, but it's a part of who I am.
I get bored for many things, why? It's not choice.
Do I have free will? I don't think so. I think thinking you have free will is a survival technique, I think too many people would kill themselves if they thought life was pointless.
As I said, religion is sooooo convenient for humans, the whole "don't commit suicide" part of Catholicism, the whole "we give you a purpose to your lives" etc.... for me, it's not quite proof, but it's huge evidence that God and gods are made by humans, for humans.