RE: Why you don't believe in free will if you believe in God/Religion! You don't...
Having a free will does not mean that you will know the outcome of what you wanted to do or what you are doing. Things might turn out to be what you are not expecting even when you think you know what will be the result. So to say that free will is knowing what an outcome will be is totally wrong to me.
Free will is to determine what you want to do whether wrong or right and or you know what the result will be or not.
Essentially, believing in someone, something, that knows all that "is, was and will be" means that you do not believe in free will
Believing in someone does not mean that you did not have free will but it's saying that "I chose to believe in you and you did not force me. I can withdrawl at anytime. I want you to direct my way, decide my fate and do anything you like with me"
So, it is reversible.