Tman, if you were to kill me it would be because you freely chose to kill me. While God would indeed know that you were going to choose to kill me, he didn't make you do it.
To attempt to answer your second question, I'm going to glean from the wisdom of the Matrix. The Oracle told Neo that what he chose wasn't as important as why he chose it. Perhaps in the book of Job it wasn't Job's loyalty or a bet with Satan that was the point, but rather the lesson Job would glean from this experience.
Now my only question is: What would you gain from killing me?
