I don't see that. We make our own puppets fight, eg in video games.

...you make an excellent point. In fact, I think you've pretty much invalidated my entire (presented) argument for free will given the existence of God.

I have an alternative argument in favour of free will (given the existence of God) if you'd like to have a look over it - it requires not just God, but a (at least vaguely) benevolent God, which is why I didn't present it earlier (it requires more assumptions therefore it is a weaker argument).

In short, the alternative argument runs as follows; start with the assumption of a benevolent God (and noting the lack of malevolence in the laws of physics as at least weak evidence for the benevolence of a deity). Note that humans, unlike the laws of physics, are capable of being malevolent towards each other; extremely malevolent, in some cases. If they were puppets of a generally benevolent God, then that malevolence is out of place; and this is therefore evidence in favour of free will. (This also implies that God considers free will more important than preventing malevolence).