Theists: How can predetermined fate and free will coexist?

[robvalue]

Still no counters to my envelope scenario.

(I put an envelope in your pocket, containing a note that you will go through the red door, although you haven't seen it. I know this is true, because I have precognition. Can you choose to go through the blue door?)

Yes, I could have chosen the blue door, and you would have had to put a note in my pocket saying I go through the blue door.  It is my choice that is controlling your actions, not the other way around.
(If I believed in such at thing)

But I didn't, I knew you'd go through the red door. I'd seen it in advance, and noted this inside the envelope. That is the scenario. Given that this is the case, can you choose go through the blue door?

If your actions control my "precognition", then it's not precognition at all. If my prediction isn't determined until after the event, it's not even a prediction.

The envelope is just a way of demonstrating the fact that a prediction is constant. It can be noted before the event. It just represents the knowledge. I get the feeling some people think a prediction can change over time.

Of course, this whole thing shows that either you don't have free will, or I can't have precognition. Get rid of either, and it works fine.

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To the envelope question.... I don't see how an unknown envelope (no matter what it contains) can effect your choice or free will.

It's just a representation of the fixed prediction.