It's pretty simple really. The basic argument goes like this:
1. God is all knowing, all seeing.
2. Ergo, God knows what will happen in the future.
3. Ergo, the future is fixed.
4. Ergo, it has already been decided whether or not I go to Hell.
The other part of the argument goes like this:
1. When Man was first created he had free will.
2. Sin has so corrupted Man's understanding of the world he is chained and cannot choose freely.
3. God can release you from Sin though Christ.
4. It is already decided who will be released from Sin (see above).
5. Anyone released from Sin would obviously choose God, because any other choice would be inconcievable.
It all swings on the idea that God has foreknowledge, and therefore the future is inherrently fixed.
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