Sorry, I don't buy predestination. We have free will, and though God knows what we're going to do with it, he does not destroy it by preordaining what we do. Otherwise, why Heaven and Hell? If God already created everyone's destiny, why bother with the messy life-on-earth thingy? Just go straight to sorting everyone out, up or down.
When I was a kid we had Choose Your Own Adventure books. You would read the book and make choices on the way that led to a different story ending. I think that’s how God works with us. A case of if you go this way this will happen. That way, this will happen. He just knows all the scenarios.
Well, it’s a good thing I’m not selling it. It just happens to be what I believe.
Why heaven and hell? I don’t believe in hell, and I hope there’s a heaven.
You’ll have to ask God about the why...I’m guessing you get a different answer than I did.