Especially not changes of mind? People are constantly changing their positions because of some outside influence. You lost me here.
Changing their 'positions' - if by this you simply mean thinking about something some other way, then no, it does not relate to the problem of motion at all. There is no physical motion involved, and no force is required.
If by position you in fact mean physical location, people do not 'change location' simply because they have been told to, or because they changed their mind. They change location because they exerted a specific amount of force.
I think you misunderstood here. The argument didnt say that physics cant understand motion. What it does say is that motion requires force. Force requires something or someone to initiate it. If you follow all forces to its source you find God.
Actually, that's exactly what the argument said. If you want to go back and change what you meant, fine. Just don't tell me that you say one thing, but mean another, and I'm supposed to automatically understand your vague verbiage.
As people have repeatedly pointed out, your argument there is flawed: Force does not necessarily require an instigator, and motion exists without force (ie, inertia). If you want to trace all motion in the universe back to the Big Bang, which I do believe is what you mean, there is quite a good deal of research left to do. Scientists are studying that phenomenon every day, but I don't think many of them have thrown up their hands and said, "God did it."
This one is dealing with motion/change the other is dealing with causes.
You also said, "motion requires force. Force requires someone or something to initiate it." That is clearly a cause/effect relationship. There is, in essence, no difference between the First Cause and your Unmoved Mover.
That's what I get for trying. Oh well..such are your tactics.
By that I simply meant that I don't try to logically prove or disprove what is logically impossible to prove or disprove. I've never tried, and never will try, to disprove the existence of God - especially not based on physics. I will, however, argue with those who try to prove it one way or the other - and I will use logic in those arguments. My 'tactics' are to respond logically, never to initiate an argument without a solid ground, etc.