It's not the thinking that's prohibited. It's certain choices.
Human freedom includes consideration and choosing, but it doesn't include defining good and evil. You either choose goodness (God), or you are free to choose otherwise, but you must live with the consequences of your choice.
Again, we are free to choose. We must simply live with the consequences of our choices.
See, I'd accept that, if God wasn't the one making the consequences. For instance, imagine seatbelt use wasn't mandatory. If I chose to get in the car without wearing it, I'm acknowledging the potential consequences. If I get into an accident, there is a greater risk of serious injury than if I wear one. The consequence is a natural one-an outcome of the act itself.
The Bible, however, teaches the opposite. God imposes the consequences for disobeying him. Moses' speech about all the curses Israel will suffer if they don't follow God, for example. Jonah being swallowed by the whale, being thrown into the lake of fire at the end of times-all examples of God saying, "I will do this to you if you don't obey me."
That's not free will. A mugger holding a gun to your head and saying, "Your money or your life" is not free will-only dictating and punishment for disobedience.
To have free will, I'd have to be able to say to God, "Nope, not happening" and not have to worry that
he'll be the one imposing the consequences.
If there are natural consequences to disobeying (such as, for example, if Joseph disobeyed God and didn't flee Bethlehem ahead of Herod's henchmen-which would have resulted in Jesus being among the massacred), that's one thing. Then I'd be able to rationally look at the
real consequences of obeying (Joseph, Mary and Jesus surviving), vice disobeying (Jesus being killed (if not all three of them)).
Unfortunately, there's no way to know what the natural consequences of not accepting Jesus might be. Many non-Christians lead happy, successful (as defined by them) lives. They aren't in want and they're not suffering, so happiness doesn't seem to be predicated solely on being a Christian, nor does success and health. The only consequences we know of are the ones God threatens us with in the Bible.
Marc