The argument of "free will" is very amusing to me (and I realize that you are shading this away from a strict Fire and Brimstone fundamentalist discussion).
1. The argument reeks of pitiful desperation to try to explain why an all powerful and good God would create evil in this word. "Um, maybe He doesn't wish to impose a moral choice on people, which would ruin his purpose for us!"
2. Why is this the purpose anyway? If one believes in God, then God has already limited us in that we cannot flap our wings and fly. He has limited us in that we can't manipulate facts as fast as a modern computer. He has limited us in our ability to protect our children against physical harm. He has limited us in our ability to oppose powerful, evil men even if a majority of the population is suffering and against a dictator- look at North Korea today. But when it comes to moral choices He instead actually likes to tempt us to make the wrong choice, and bets with Satan as to our choice (if you believe the Bible). Sure- He is willing to kill many, many thousands or millions in earthquakes, Tsunamis, fires, hurricanes, and tornados, but He would never want to interfere in our lives- a moral Prime Directive as it were.
3. How is it "free choice" if we have been informed that making the wrong choice results in immediate punishment and/or everlasting Hell? In fact even on Earth and in almost all cases no one can make another person do anything they don't want to do: they can only make the alternative exceedingly unpleasant. How is this any different from the "free will" of God? "Do whatever you want! You are free! If you choose wrong I will put in in a horrible place for all eternity and you will suffer forever. But make whatever choice you wish- you have free will!"
The more sophisticated (True Christian?) theologians will argue that Hell is not a place of suffering, it is just a place removed from God- in essence if you reject Him, He does not want you around. But clearly even in this toned down version of fire and brimstone preaching the concept of Hell is still meant to be horrible and undesirable.
Finally the argument that God doesn't need us to bow down and worship Him. That is not how the Ten Commandments, let alone the remainder of the Bible, read to me.