Anyone who exercises free will shall be instantly vaporized.
Well, not exactly, since "free will" description only applies to any decision which God hasn't already issued a law/rule about.
If you violate Divine Will, then YOU will be instantly vaporized, but that's becuase Divine Will over-rides man's exercise of his own free will.
No doubt the rules will be so well-defined and fleshed out, that there will be little if anything not already dictated by Decree of God, and hence little left to exercise one's "free will" (eg "do you want vanilla or chocolate ice cream for dessert?"). Might as well be made into a robot, if you don't want to die (and there's always instant suicide, if you don't want to play along any longer).